To simplify the expression \((73^4)^5\) using the Power Rule of Exponents, which states that \((a^m)^n = a^{m \cdot n}\), we can apply it directly here.
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Identify \(a\), \(m\), and \(n\):
- \(a = 73\)
- \(m = 4\)
- \(n = 5\)
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Use the Power Rule: \[ (73^4)^5 = 73^{4 \cdot 5} = 73^{20} \]
Thus, the simplified expression is \(\boxed{73^{20}}\).