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[tex]4\frac{1}{2}\cdot\frac{3}{4}=\frac{9}{2}\cdot\frac{3}{4}=\frac{27}{8}=3\frac{3}{8}\\\\\frac{5}{7}\cdot2\frac{3}{4}=\frac{5}{7}\cdot\frac{11}{4}=\frac{55}{28}=1\frac{27}{28}\\\\2\frac{4}{5}\cdot3\frac{2}{3}=\frac{14}{5}\cdot\frac{11}{3}=\frac{154}{15}=10\frac{4}{15}\\\\1\frac{2}{3}\cdot2\frac{1}{7}=\frac{5}{\not3_1}\cdot\frac{\not15^5}{7}=\frac{25}{7}=3\frac{4}{7}\\\\3\frac{1}{4}\cdot1\frac{2}{5}=\frac{13}{4}\cdot\frac{7}{5}=\frac{91}{20}=4\frac{11}{20}[/tex]