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The number given is 216k, or 216000.

Using a calculator, you could just simply plug in radical 216000.

Once you get the number (which in this case is 464.758001545), you plug it into the 4th power.

Once you plug it to the 4th power, the answer should be 46656000000

Or in scientific notation: (4.6656 × 10^9)

If you mean k is a variable......

\((\sqrt{216k})^4\\ =(216k)^2\\ =46656k^2\)

I have proved that the answer to the question must have large numbers. LOL