Finding the Fourth Proportional to 647,215.80, 970,061.18 and 291,813.72

Step by Step Solution

1. Step 1: Write the proportion equation
   647,215.80 : 970,061.18 = 291,813.72 : x
2. Step 2: Convert to fraction form
   647,215.80/970,061.18 = 291,813.72/x
3. Step 3: Cross multiply
   647,215.80x = 970,061.18 × 291,813.72
4. Step 4: Simplify right side
   647,215.80x = 283,077,161,563.39
5. Step 5: Solve for x
   x = 283,077,161,563.39/647,215.80
6. Step 6: Final answer
   x = 437,376.78