Finding the Fourth Proportional to 498,200.10, 747,300.15 and 428,216.10

Step by Step Solution

1. Step 1: Write the proportion equation
   498,200.10 : 747,300.15 = 428,216.10 : x
2. Step 2: Convert to fraction form
   498,200.10/747,300.15 = 428,216.10/x
3. Step 3: Cross multiply
   498,200.10x = 747,300.15 × 428,216.10
4. Step 4: Simplify right side
   498,200.10x = 320,005,955,762.42
5. Step 5: Solve for x
   x = 320,005,955,762.42/498,200.10
6. Step 6: Final answer
   x = 642,324.15