Найти неизвестный член пропорции

Решите задачу:

$10 \div \frac{1}{8} = x \div 1 \frac{1}{4} \\ \\ 10 \frac{1}{4} = x \times \frac{1}{8} \\ \\ 10 \times \frac{5}{4} = \frac{1}{8} x \\ \\ 5 \times \frac{5}{2} = \frac{1}{8} x \\ \\ \frac{25}{2} = \frac{1}{8} x \\ \\ 100 = x \\ \\ x = 100 \\ \\ - - - - - - - - - - - - - \\ \\ x \div 0.75 = 9 \frac{1}{2} \div 14 \frac{1}{4} \\ \\ x \times 14 \frac{1}{4} = 9 \frac{1}{2} \times 0.75 \\ \\ x \times \frac{57}{4} = \frac{19}{2} \times \frac{3}{4} \\ \\ \frac{57}{4} x = \frac{57}{8} \\ \\ x = 0.5 \\ \\ - - - - - - - - - - - - - \\ \\ \frac{x}{15} = \frac{1.456}{1.05} \\ \\ \frac{x}{15} = \frac{ \frac{ \frac{182}{125} }{21} }{20} \\ \\ \frac{x}{15} = \frac{104}{75} \\ \\ 75x = 1560 \\ \\ x = 20.8$