\( 2\frac{1}{6} = \frac{2 \cdot 6 + 1}{6} = \frac{13}{6} \)
\( 3\frac{3}{7} = \frac{3 \cdot 7 + 3}{7} = \frac{24}{7} \)
\( 1\frac{5}{13} = \frac{1 \cdot 13 + 5}{13} = \frac{18}{13} \)
\[ \frac{\frac{13}{6}}{x} = \frac{\frac{24}{7}}{\frac{18}{13}} \]
\[ x = \frac{\frac{13}{6} \cdot \frac{18}{13}}{\frac{24}{7}} \]
\[ x = \frac{\frac{13 \cdot 18}{6 \cdot 13}}{\frac{24}{7}} = \frac{\frac{18}{6}}{\frac{24}{7}} = \frac{3}{\frac{24}{7}} \]
\[ x = 3 : \frac{24}{7} = 3 \cdot \frac{7}{24} = \frac{3 \cdot 7}{24} = \frac{21}{24} \]
\[ x = \frac{21}{24} = \frac{7}{8} \]
Ответ: x = \(\frac{7}{8}\).