Answer
$$x =\frac{d\ln 5}{\ln c}$$
Work Step by Step
Given $$\log_{5}(c^x)=d $$
Then
\begin{align*}
\log_{5}(c^x)&=d \\
\frac{\ln c^x}{\ln 5}&=d\\
\ln c^x&=d\ln 5\\
x\ln c&=d\ln 5\\
x&=\frac{d\ln 5}{\ln c}
\end{align*}
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