Finding the Fourth Proportional to 1,123,137.38, 1,550,204.98 and 639,987.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123,137.38 : 1,550,204.98 = 639,987.32 : x
2. Step 2: Convert to fraction form
   1,123,137.38/1,550,204.98 = 639,987.32/x
3. Step 3: Cross multiply
   1,123,137.38x = 1,550,204.98 × 639,987.32
4. Step 4: Simplify right side
   1,123,137.38x = 992,111,530,600.85
5. Step 5: Solve for x
   x = 992,111,530,600.85/1,123,137.38
6. Step 6: Final answer
   x = 883,339.43