$$ \begin{aligned} 240 &= 300 \cdot \frac{x}{1050}&& \text{multiply ALL terms by } \color{blue}{ 1050 }. \\[1 em]1050\cdot240 &= 1050\cdot300 \cdot \frac{x}{1050}&& \text{cancel out the denominators} \\[1 em]252000 &= 300x&& \text{ swap the left and right side of the equation } \\[1 em]300x &= 252000&& \text{ divide both sides by $ 300 $ } \\[1 em]x &= \frac{252000}{300}&& \\[1 em]x &= 840&& \\[1 em] \end{aligned} $$

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