Solve for x.

To solve for \( x \) in the equation

\[ \frac{3}{4} = \frac{x}{24}, \]

you can use cross multiplication. This gives:

\[ 3 \times 24 = 4 \times x. \]

Calculating the left side:

\[ 3 \times 24 = 72, \]

so the equation becomes:

\[ 72 = 4x. \]

Now, divide both sides by 4 to solve for \( x \):

\[ x = \frac{72}{4} = 18. \]

Thus, the solution is

\[ \boxed{18}. \]