Finding the Fourth Proportional to 1,222,766.29, 1,687,470.18 and 678,902.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222,766.29 : 1,687,470.18 = 678,902.15 : x
2. Step 2: Convert to fraction form
   1,222,766.29/1,687,470.18 = 678,902.15/x
3. Step 3: Cross multiply
   1,222,766.29x = 1,687,470.18 × 678,902.15
4. Step 4: Simplify right side
   1,222,766.29x = 1,145,627,121,431.03
5. Step 5: Solve for x
   x = 1,145,627,121,431.03/1,222,766.29
6. Step 6: Final answer
   x = 936,914.22