Answer
$\approx630$
Work Step by Step
Using the table, the z-score corresponding to the $90$th percentile is $\approx1.3$.
$\text{z-score}=\frac{\text{data item-mean}}{\text{standard deviation}}$.
$\text{data item}=\text{z-score}\cdot{\text{standard deviation}}+\text{mean}$
Hence here the data item: $1.3\cdot100+500=630$
