$$ \begin{aligned} \frac{360}{4} &= \frac{x}{3}&& \text{multiply ALL terms by } \color{blue}{ 12 }. \\[1 em]12\cdot\frac{360}{4} &= 12 \cdot \frac{x}{3}&& \text{cancel out the denominators} \\[1 em]1080 &= 4x&& \text{ swap the left and right side of the equation } \\[1 em]4x &= 1080&& \text{ divide both sides by $ 4 $ } \\[1 em]x &= \frac{1080}{4}&& \\[1 em]x &= 270&& \\[1 em] \end{aligned} $$

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