Answer
$$x=788$$
Work Step by Step
To solve the proportion, we put the product of the means equal to the product of the extremes as follows:
$$\frac{61.1}{81.3}=\frac{592}{x}\Longrightarrow x\times 61.1= 592\times 81.3\Longrightarrow x=\frac{ 592\times 81.3}{61.1}=787.718 \approx 788$$
