$$ \begin{aligned} \frac{653}{1000} &= \frac{154000000}{x}&& \text{multiply ALL terms by } \color{blue}{ 1000x }. \\[1 em]1000x\cdot\frac{653}{1000} &= 1000x\cdot\frac{154000000}{x}&& \text{cancel out the denominators} \\[1 em]653x &= 154000000000&& \text{ divide both sides by $ 653 $ } \\[1 em]x &= \frac{154000000000}{653}&& \\[1 em] \end{aligned} $$

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