\[\boxed{\text{4.\ 226}}\]
\[\frac{\frac{1,5}{2,4}\ :\frac{3}{4} + \frac{7,7}{4,5} \cdot 2\frac{1}{7}}{2,6 \cdot 8 - 2,263\ :0,31} =\]
\[= \frac{\frac{15}{24} \cdot \frac{4}{3} + \frac{77}{45} \cdot \frac{15}{7}}{20,8 - 7,3} = \frac{\frac{5}{6} + \frac{11}{3}}{13,5} =\]
\[= \frac{\frac{5}{6} + \frac{22}{6}}{13,5} = \frac{27}{6}\ :\frac{135}{10} = \frac{9}{2} \cdot \frac{10}{135} =\]
\[= \frac{5}{15} = \frac{1}{3}\]