Finding the Fourth Proportional to 738,402.58, 1,018,996.20 and 398,870.83

Step by Step Solution

1. Step 1: Write the proportion equation
   738,402.58 : 1,018,996.20 = 398,870.83 : x
2. Step 2: Convert to fraction form
   738,402.58/1,018,996.20 = 398,870.83/x
3. Step 3: Cross multiply
   738,402.58x = 1,018,996.20 × 398,870.83
4. Step 4: Simplify right side
   738,402.58x = 406,447,861,334.59
5. Step 5: Solve for x
   x = 406,447,861,334.59/738,402.58
6. Step 6: Final answer
   x = 550,442.09