$$x+\frac{4}{100}x+\frac{1}{10}x = 115000$$

$$ \begin{aligned} x+\frac{4}{100}x+\frac{1}{10}x &= 115000&& \text{multiply ALL terms by } \color{blue}{ 100 }. \\[1 em]100x+100 \cdot \frac{4}{100}x+100\frac{1}{10}x &= 100\cdot115000&& \text{cancel out the denominators} \\[1 em]100x+4x+10x &= 11500000&& \text{simplify left side} \\[1 em]114x &= 11500000&& \text{ divide both sides by $ 114 $ } \\[1 em]x &= \frac{11500000}{114}&& \\[1 em]x &= \frac{5750000}{57}&& \\[1 em] \end{aligned} $$

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