5.0*10^13 = .029/x(.18)^4

Re:  5.0*10^13 = .029/x(.18)^4 

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solve?

$$5.0\times10^{13}=\frac{0.029}{x}\times0.18^4\\\\
\frac{5.0\times10^{13}}{0.18^4}=\frac{0.029}{x}\\\\
\frac{0.18^4}{5.0\times10^{13}}=\frac{x}{0.029}\\\\
\frac{0.18^4}{5.0\times10^{13}}\times0.029=x\\\\$$

$$x=6.0886\times10^{-19}$$