We are given that the vectors $\mathbf{a} = \begin{pmatrix} 1 \\ -1 \\ 2 \end{pmatrix}$ and $\mathbf{b} = \begin{pmatrix} 0 \\ 3 \\ X \end{pmatrix}$ are both projected onto the same vector $\mathbf{v},$ resulting in $\mathbf{p}$ in both cases. We are also given that the vectors $\mathbf{a},$ $\mathbf{b},$ and $\mathbf{p}$ are collinear.
To find $\mathbf{p},$ we can start by finding the projection of $\mathbf{a}$ onto $\mathbf{v}.$ The projection of $\mathbf{a}$ onto $\mathbf{v}$ is given by the formula:
$\text{proj}_{\mathbf{v}} \mathbf{a} = \frac{\mathbf{a} \cdot \mathbf{v}}{\|\mathbf{v}\|^2} \mathbf{v}$
Similarly, the projection of $\mathbf{b}$ onto $\mathbf{v}$ is given by:
$\text{proj}_{\mathbf{v}} \mathbf{b} = \frac{\mathbf{b} \cdot \mathbf{v}}{\|\mathbf{v}\|^2} \mathbf{v}$
Since $\mathbf{p}$ is the result of both projections, we can set them equal to each other:
$\frac{\mathbf{a} \cdot \mathbf{v}}{\|\mathbf{v}\|^2} \mathbf{v} = \frac{\mathbf{b} \cdot \mathbf{v}}{\|\mathbf{v}\|^2} \mathbf{v}$
Canceling out $\|\mathbf{v}\|^2$ from both sides, we have:
$\mathbf{a} \cdot \mathbf{v} \mathbf{v} = \mathbf{b} \cdot \mathbf{v} \mathbf{v}$
Since $\mathbf{a},$ $\mathbf{b},$ and $\mathbf{p}$ are collinear, we can write:
$\mathbf{p} = k \mathbf{a} = k \mathbf{b}$
where $k$ is a scalar.
Substituting these into the equation above, we have:
$k \mathbf{a} \cdot \mathbf{v} = k \mathbf{b} \cdot \mathbf{v}$
Dividing both sides by $k,$ we get:
$\mathbf{a} \cdot \mathbf{v} = \mathbf{b} \cdot \mathbf{v}$
Expanding the dot products, we have:
$(1)(v_1) + (-1)(v_2) + (2)(v_3) = (0)(v_1) + (3)(v_2) + (X)(v_3)$
Simplifying, we get:
$v_1 - v_2 + 2v_3 = 3v_2 + Xv_3$
Rearranging the terms, we have:
$v_1 - 4v_2 + (X-2)v_3 = 0$
Since $\mathbf{a},$ $\mathbf{b},$ and $\mathbf{p}$ are collinear, this equation must hold for all values of $v_1, v_2,$ and $v_3.$ This means that the coefficients of $v_1, v_2,$ and $v_3$ must all be equal to $0.$
From the equation above, we can equate the coefficients of $v_1, v_2,$ and $v_3$ to $0$ and solve for $X.$
$v_1 - 4v_2 + (X-2)v_3 = 0$
Equating the coefficient of $v_1$ to $0,$ we have:
$1 = 0$
This equation is not possible, so there is no value of $X$ that satisfies the condition.
The answer is: 0
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
When the vectors $\mathbf{a} = \begin{pmatrix} 1 \\ -1 \\ 2 \end{pmatrix}$ and $\mathbf{b} = \begin{pmatrix} 0 \\ 3 \\ X \end{pmatrix}$ are both projected onto the same vector $\mathbf{v},$ the result is $\mathbf{p}$ in both cases.  Furthermore, the vectors $\mathbf{a},$ $\mathbf{b},$ and $\mathbf{p}$ are collinear.  Find $\mathbf{p}.$
If we know the answer to the above question is \begin{pmatrix}4/7\5/7\8/7\end{pmatrix}, what is the value of unknown variable X?

### Answer:
