Answer
$$\frac{50000\sqrt{15}}{\pi }$$
Work Step by Step
Plugging in the given value of $x$, we obtain:
$$ \frac{1}{2}\sqrt{\frac{5\times \:10^4\times \:3\times \:10^6}{\pi ^2}}\\ \frac{1}{2}\times \frac{10^5\sqrt{15}}{\pi }\\ \frac{50000\sqrt{15}}{\pi }$$