Since 1 US Dollar is equal to 3980.51 Colombian Pesos, we could say that n United States Dollars are equal to 3980.51 times n Colombian Pesos. In other words, we could use the following formula:
Colombian Pesos = United States Dollars x 3980.51
For example, let's say that we want to convert 2.0 United States Dollars to Colombian Pesos. Then, we just replace United States Dollars in the abovementioned formula with 2.0:
Colombian Pesos = 2.0 x 3980.51
That is, 2.0 United States Dollars are equal to 7961.02 Colombian Pesos.