4. \(1\frac{4}{9}\cdot1\frac{9}{13}\cdot1\frac{7}{11}=\)

\(1\frac{4}{9}=\frac{13}{9}\), \(1\frac{9}{13}=\frac{22}{13}\), \(1\frac{7}{11}=\frac{18}{11}\).

\(\frac{13}{9}\cdot\frac{22}{13}\cdot\frac{18}{11}=\frac{22}{11}\cdot\frac{18}{9}=2\cdot2=4\).

Ответ: 4.