Решение:
\[ 1\frac{1}{7} - \frac{3}{35} = \frac{8}{7} - \frac{3}{35} = \frac{8 \times 5}{7 \times 5} - \frac{3}{35} = \frac{40}{35} - \frac{3}{35} = \frac{37}{35} \]
\[ 4\frac{3}{8} \times \frac{37}{35} = \frac{35}{8} \times \frac{37}{35} = \frac{37}{8} \]
\[ 15\frac{4}{7} - \frac{37}{8} = \frac{109}{7} - \frac{37}{8} = \frac{109 \times 8 - 37 \times 7}{7 \times 8} = \frac{872 - 259}{56} = \frac{613}{56} = 10\frac{53}{56} \]
Ответ: \[ 10\frac{53}{56} \]