Finding the Fourth Proportional to 677,426.69, 1,016,310.90 and 478,136.32

Step by Step Solution

1. Step 1: Write the proportion equation
   677,426.69 : 1,016,310.90 = 478,136.32 : x
2. Step 2: Convert to fraction form
   677,426.69/1,016,310.90 = 478,136.32/x
3. Step 3: Cross multiply
   677,426.69x = 1,016,310.90 × 478,136.32
4. Step 4: Simplify right side
   677,426.69x = 485,935,150,264.61
5. Step 5: Solve for x
   x = 485,935,150,264.61/677,426.69
6. Step 6: Final answer
   x = 717,325.07