Finding the Fourth Proportional to 1,123,657.59, 1,550,267.61 and 639,879.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123,657.59 : 1,550,267.61 = 639,879.69 : x
2. Step 2: Convert to fraction form
   1,123,657.59/1,550,267.61 = 639,879.69/x
3. Step 3: Cross multiply
   1,123,657.59x = 1,550,267.61 × 639,879.69
4. Step 4: Simplify right side
   1,123,657.59x = 991,984,757,703.84
5. Step 5: Solve for x
   x = 991,984,757,703.84/1,123,657.59
6. Step 6: Final answer
   x = 882,817.65