Question
$$\frac{4}{6} = \frac{x}{18}$$
Answer
$$ x = 12 $$
Explanation
$$ \begin{aligned} \frac{4}{6} &= \frac{x}{18}&& \text{multiply ALL terms by } \color{blue}{ 18 }. \\[1 em]18\cdot\frac{4}{6} &= 18 \cdot \frac{x}{18}&& \text{cancel out the denominators} \\[1 em]12 &= x&& \text{ swap the left and right side of the equation } \\[1 em]x &= 12&& \\[1 em]x &= 12&& \\[1 em] \end{aligned} $$
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