Finding the Fourth Proportional to 1,123,642.88, 1,550,247.32 and 639,865.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123,642.88 : 1,550,247.32 = 639,865.04 : x
2. Step 2: Convert to fraction form
   1,123,642.88/1,550,247.32 = 639,865.04/x
3. Step 3: Cross multiply
   1,123,642.88x = 1,550,247.32 × 639,865.04
4. Step 4: Simplify right side
   1,123,642.88x = 991,949,063,421.69
5. Step 5: Solve for x
   x = 991,949,063,421.69/1,123,642.88
6. Step 6: Final answer
   x = 882,797.44