Since 1 US Dollar is equal to 18.0378 South African Rand, we could say that n United States Dollars are equal to 18.0378 times n South African Rand. In other words, we could use the following formula:
South African Rand = United States Dollars x 18.0378
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 18.0378
That is, 2.0 United States Dollars are equal to 36.0756 South African Rand.