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Given I_3 * R_3 = I_1 * R_1, I_x * R_x = I_2 * R_2, solve for R_x

I am trying to find out the math used to divide the 2 equations and come up with the solution below and isolate Rx. Any help is appreciated.

. . . . .[tex]I_3\, \cdot\, R_3\, =\, I_1\, \cdot\, R_1[/tex]

. . . . .[tex]I_x\, \cdot\, R_x\, =\, I_2\, \cdot\, R_2[/tex]

The equations are divided and rearranged, giving the below. Not sure how the match was done?

. . . . .[tex]R_x\, =\, \dfrac{R_2\, \cdot\, I_2\, \cdot\, I_3\, \cdot\, R_3}{R_1\, \cdot\, I_1\, \cdot\, I_x}[/tex]

Thanks