To solve for \( x \) in the equation \( x^3 = 12 \), you need to take the cube root of both sides.
\[ x = \sqrt[3]{12} \]
Calculating the cube root of 12:
\[ \sqrt[3]{12} \approx 2.29 \]
None of the provided options (36, 4, 9, 15) match this result, so it appears that there are no correct answers listed among the options given.
If the options were intended to represent the value of \( x^3 = 12 \), then the value of \( x \) does not match any of the selections given. If you were looking for a simple answer or a different operation, please clarify!