\( \Large \frac{4}{7} = 0.57, \frac{5}{13} = 0.38, \frac{6}{11} = 0.54, \frac{3}{5} = 0.6, \frac{2}{3} = 0.67 \)
So the second smallest fraction is \( \Large \frac{6}{11} \)
1088.88 + 1800.08 + 1880.80 = 4769.76
6435.9 + 7546.4 + 1203.5 = 15185.8
\( \Large \frac{16}{23} \times \frac{47}{288} \times \frac{92}{141} = \frac{4}{18 \times 3} = \frac{2}{9 \times 3} = \frac{2}{27} \)
\( \Large 1\frac{3}{5}+1\frac{8}{9}+2\frac{4}{5} = \left(1+1+2\right) + \left(\frac{3}{5}+\frac{8}{9}+\frac{4}{5}\right) \) \( \Large 4 + \frac{27+40+36}{45} \) \( \Large 4 + \frac{103}{45} = 4 + 2\frac{13}{45} = 6\frac{13}{45} \)
\( \Large \frac{19999}{21111} = 0.947 \)
\( \Large ? = \frac{1212}{0.5 \times 6.06} = \frac{1212}{5 \times 606} \times 10 \times 100 \) = \( \Large \frac{1212}{3030} \times 1000 = \frac{1212 \times 100}{303} = 400 \)