Finding the Fourth Proportional to 1,225,356.72, 1,690,977.24 and 688,812.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,225,356.72 : 1,690,977.24 = 688,812.72 : x
2. Step 2: Convert to fraction form
   1,225,356.72/1,690,977.24 = 688,812.72/x
3. Step 3: Cross multiply
   1,225,356.72x = 1,690,977.24 × 688,812.72
4. Step 4: Simplify right side
   1,225,356.72x = 1,164,766,632,142.49
5. Step 5: Solve for x
   x = 1,164,766,632,142.49/1,225,356.72
6. Step 6: Final answer
   x = 950,553.10