\( 1 \leftarrow | \left. \begin{array} { l } { \frac { x } { 8 } = 14 } \\ { x = \square } \end{array} \right. \)

To find the value of \( x \) in the equation \( \frac{x}{8} = 14 \), you simply multiply both sides by 8. This gives you \( x = 14 \times 8 \). Doing the math, you find that \( x = 112 \). So, the box can be filled in with 112! Additionally, it's a common mistake to forget to multiply by the whole number when working with fractions. Always remember to reverse the fraction by performing the opposite operation! Here, instead of dividing, you multiplied to isolate \( x \) – a crucial step that can save you from errors.