Finding the Fourth Proportional to 1,123,411.68, 1,549,929.60 and 639,634.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123,411.68 : 1,549,929.60 = 639,634.59 : x
2. Step 2: Convert to fraction form
   1,123,411.68/1,549,929.60 = 639,634.59/x
3. Step 3: Cross multiply
   1,123,411.68x = 1,549,929.60 × 639,634.59
4. Step 4: Simplify right side
   1,123,411.68x = 991,388,584,224.86
5. Step 5: Solve for x
   x = 991,388,584,224.86/1,123,411.68
6. Step 6: Final answer
   x = 882,480.22