Finding the Fourth Proportional to 639,016.83, 953,292.12 and 621,642.47

Step by Step Solution

1. Step 1: Write the proportion equation
   639,016.83 : 953,292.12 = 621,642.47 : x
2. Step 2: Convert to fraction form
   639,016.83/953,292.12 = 621,642.47/x
3. Step 3: Cross multiply
   639,016.83x = 953,292.12 × 621,642.47
4. Step 4: Simplify right side
   639,016.83x = 592,606,861,010.72
5. Step 5: Solve for x
   x = 592,606,861,010.72/639,016.83
6. Step 6: Final answer
   x = 927,372.85