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To solve the equation \( x^{\frac{2}{3}} = 64 \), we can first isolate \( x \) by raising both sides of the equation to the reciprocal of the exponent \( \frac{2}{3} \), which is \( \frac{3}{2} \).
\[
x = 64^{\frac{3}{2}}
\]
Now we can calculate \( 64^{\frac{3}{2}} \).
First, find the square root of \( 64 \):
\[
\sqrt{64} = 8
\]
Next, raise that result to the power of 3:
\[
8^3 = 512
\]
Therefore, the solution to the equation \( x^{\frac{2}{3}} = 64 \) is:
\[
x = 512
\]
Thus, among the response options, the answer is **512**.