[latex] \frac{x}{4}= \frac{5}{7}[/latex] [latex]7*x=4*5[/latex] [latex]7x=20[/latex] [latex]x=2\frac{6}{20}[/latex] [latex]x=2\frac{3}{10}[/latex]

[latex]x/4=5/7 \\ 7x=4*5 \\ 7x=20 \\ x=20/7 \\ x=2+6/7[/latex]