Решение:
\[ 3 \frac{1}{12} = \frac{3 \times 12 + 1}{12} = \frac{36 + 1}{12} = \frac{37}{12} \]
\[ \frac{5}{6} + \frac{37}{12} = \frac{5 \times 2}{6 \times 2} + \frac{37}{12} = \frac{10}{12} + \frac{37}{12} = \frac{10 + 37}{12} = \frac{47}{12} \]
\[ \frac{47}{12} \times \frac{9}{59} = \frac{47 \times 9}{12 \times 59} \]
\[ \frac{47 \times 9}{12 \times 59} = \frac{47 \times (3 \times 3)}{(4 \times 3) \times 59} = \frac{47 \times 3}{4 \times 59} = \frac{141}{236} \]
Ответ: 141/236