To find the modular inverse of $27$ modulo $28$, we need to find an integer $x$ such that $27x \equiv 1 \pmod{28}$.
We can start by checking possible values of $x$ from $0$ to $27$ and see which one satisfies the congruence.
Checking $x = 1$, we have $27(1) \equiv 27 \not\equiv 1 \pmod{28}$.
Checking $x = 2$, we have $27(2) \equiv 54 \equiv 26 \not\equiv 1 \pmod{28}$.
Checking $x = 3$, we have $27(3) \equiv 81 \equiv 25 \not\equiv 1 \pmod{28}$.
And so on...
Checking $x = 27$, we have $27(27) \equiv 729 \equiv 1 \pmod{28}$.
Therefore, the modular inverse of $27$ modulo $28$ is $\boxed{27}$.
The answer is: 27
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Find the modular inverse of $27$, modulo $28$.

Express your answer as an integer from $0$ to $27$, inclusive.

### Answer:
