Finding the Fourth Proportional to 647,066.20, 971,474.10 and 410,870.20

Step by Step Solution

1. Step 1: Write the proportion equation
   647,066.20 : 971,474.10 = 410,870.20 : x
2. Step 2: Convert to fraction form
   647,066.20/971,474.10 = 410,870.20/x
3. Step 3: Cross multiply
   647,066.20x = 971,474.10 × 410,870.20
4. Step 4: Simplify right side
   647,066.20x = 399,149,757,761.82
5. Step 5: Solve for x
   x = 399,149,757,761.82/647,066.20
6. Step 6: Final answer
   x = 616,860.78