To find the value of $x$, we need more information, such as the lengths of the corresponding sides of triangles $\triangle ABC$ and $\triangle FGH$. Since the triangles are similar, the ratios of their corresponding sides will be equal.

The formula to use here is: $\frac{AB}{FG} = \frac{BC}{GH} = \frac{AC}{FH}$

Without the lengths of at least some of these sides, it's impossible to determine $x$. Could you provide the side lengths or a diagram with labeled measurements?

Follow-up Questions:

1. What are the side lengths of triangle $ABC$ and $FGH$?
2. Are there any other measurements or angles given in the problem?
3. Is $x$ the length of one of the sides, or is it related to a different aspect of the triangles?
4. Are there any ratios provided in the problem statement?
5. Can you upload a photo of the problem if there are diagrams or further details?

Tip: In similar triangles, corresponding angles are equal, and corresponding side lengths are proportional. Use these properties to set up equations and solve for unknowns.