Finding the Fourth Proportional to 648,066.80, 970,399.20 and 457,498.10

Step by Step Solution

1. Step 1: Write the proportion equation
   648,066.80 : 970,399.20 = 457,498.10 : x
2. Step 2: Convert to fraction form
   648,066.80/970,399.20 = 457,498.10/x
3. Step 3: Cross multiply
   648,066.80x = 970,399.20 × 457,498.10
4. Step 4: Simplify right side
   648,066.80x = 443,955,790,241.52
5. Step 5: Solve for x
   x = 443,955,790,241.52/648,066.80
6. Step 6: Final answer
   x = 685,046.34