Question
$$\frac{x}{42} = \frac{49}{63}$$
Answer
$$ x = \dfrac{98}{3} $$
Explanation
$$ \begin{aligned} \frac{x}{42} &= \frac{49}{63}&& \text{multiply ALL terms by } \color{blue}{ 126 }. \\[1 em]126 \cdot \frac{x}{42} &= 126\cdot\frac{49}{63}&& \text{cancel out the denominators} \\[1 em]3x &= 98&& \text{ divide both sides by $ 3 $ } \\[1 em]x &= \frac{98}{3}&& \\[1 em] \end{aligned} $$
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