Since 1 US Dollar is equal to 18.752687 South African Rand, we could say that n United States Dollars are equal to 18.752687 times n South African Rand. In other words, we could use the following formula:
South African Rand = United States Dollars x 18.752687
For example, let's say that we want to convert 2.0 United States Dollars to South African Rand. Then, we just replace United States Dollars in the abovementioned formula with 2.0:
South African Rand = 2.0 x 18.752687
That is, 2.0 United States Dollars are equal to 37.505374 South African Rand.