Finding the Fourth Proportional to 1,123,078.86, 1,550,124.35 and 639,929.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123,078.86 : 1,550,124.35 = 639,929.55 : x
2. Step 2: Convert to fraction form
   1,123,078.86/1,550,124.35 = 639,929.55/x
3. Step 3: Cross multiply
   1,123,078.86x = 1,550,124.35 × 639,929.55
4. Step 4: Simplify right side
   1,123,078.86x = 991,970,377,739.54
5. Step 5: Solve for x
   x = 991,970,377,739.54/1,123,078.86
6. Step 6: Final answer
   x = 883,259.77