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3\times 3.6=4x
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 3x, the least common multiple of x,3.
10.8=4x
Multiply 3 and 3.6 to get 10.8.
4x=10.8
Swap sides so that all variable terms are on the left hand side.
x=\frac{10.8}{4}
Divide both sides by 4.
x=\frac{108}{40}
Expand \frac{10.8}{4} by multiplying both numerator and the denominator by 10.
x=\frac{27}{10}
Reduce the fraction \frac{108}{40} to lowest terms by extracting and canceling out 4.