Translate to a proportion and solve. 86.8 is $43 \frac{2}{5} \%$ of what? 86.8 is $43 \frac{2}{5} \%$ of $\square$. (Simplify your answer.)

Step 1 ：Translate to a proportion and solve. 86.8 is $43 \frac{2}{5} \%$ of what? 86.8 is $43 \frac{2}{5} \%$ of $\square$. (Simplify your answer.)

Step 2 ：To solve for x, we can cross-multiply and then divide. This gives us the equation x = (86.8 * 100) / 43.4.

Step 3 ：Solving the equation gives x = 200.0

Step 4 ：Final Answer: $\boxed{200.0}$