Finding the Fourth Proportional to 1,222,738.27, 1,687,431.56 and 678,874.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222,738.27 : 1,687,431.56 = 678,874.10 : x
2. Step 2: Convert to fraction form
   1,222,738.27/1,687,431.56 = 678,874.10/x
3. Step 3: Cross multiply
   1,222,738.27x = 1,687,431.56 × 678,874.10
4. Step 4: Simplify right side
   1,222,738.27x = 1,145,553,569,775.07
5. Step 5: Solve for x
   x = 1,145,553,569,775.07/1,222,738.27
6. Step 6: Final answer
   x = 936,875.54