Finding the Fourth Proportional to 1,123,640.88, 1,550,244.56 and 639,863.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123,640.88 : 1,550,244.56 = 639,863.04 : x
2. Step 2: Convert to fraction form
   1,123,640.88/1,550,244.56 = 639,863.04/x
3. Step 3: Cross multiply
   1,123,640.88x = 1,550,244.56 × 639,863.04
4. Step 4: Simplify right side
   1,123,640.88x = 991,944,196,905.06
5. Step 5: Solve for x
   x = 991,944,196,905.06/1,123,640.88
6. Step 6: Final answer
   x = 882,794.69