Finding the Fourth Proportional to 825,870.74, 1,139,857.21 and 538,892.60

Step by Step Solution

1. Step 1: Write the proportion equation
   825,870.74 : 1,139,857.21 = 538,892.60 : x
2. Step 2: Convert to fraction form
   825,870.74/1,139,857.21 = 538,892.60/x
3. Step 3: Cross multiply
   825,870.74x = 1,139,857.21 × 538,892.60
4. Step 4: Simplify right side
   825,870.74x = 614,260,610,499.98
5. Step 5: Solve for x
   x = 614,260,610,499.98/825,870.74
6. Step 6: Final answer
   x = 743,773.31