Since 1 Hong Kong Dollar is equal to 2.09643707401 South African Rand, we could say that n Hong Kong Dollars are equal to 2.09643707401 times n South African Rand. In other words, we could use the following formula:
South African Rand = Hong Kong Dollars x 2.09643707401
For example, let's say that we want to convert 2 Hong Kong Dollars to South African Rand. Then, we just replace Hong Kong Dollars in the abovementioned formula with 2:
South African Rand = 2 x 2.09643707401
That is, 2 Hong Kong Dollars are equal to 4.19287414802 South African Rand.