For a quadratic equation to have only one solution, the discriminant must be equal to zero.
In this case, the discriminant is $(-12)^2 - 4(p)(4)$.
Setting this equal to zero and simplifying, we get $144 - 16p = 0$.
Solving for $p$, we find $p = \boxed{9}$.
The answer is: 9
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Find a nonzero $p$ such that $px^2-12x+4=0$ has only one solution.

### Answer:
