Finding the Fourth Proportional to 834,260.50, 1,240,658.78 and 807,688.18

Step by Step Solution

1. Step 1: Write the proportion equation
   834,260.50 : 1,240,658.78 = 807,688.18 : x
2. Step 2: Convert to fraction form
   834,260.50/1,240,658.78 = 807,688.18/x
3. Step 3: Cross multiply
   834,260.50x = 1,240,658.78 × 807,688.18
4. Step 4: Simplify right side
   834,260.50x = 1,002,065,432,019.22
5. Step 5: Solve for x
   x = 1,002,065,432,019.22/834,260.50
6. Step 6: Final answer
   x = 1,201,142.13