Finding the Fourth Proportional to 1,006,785.18, 1,389,656.31 and 657,978.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,006,785.18 : 1,389,656.31 = 657,978.06 : x
2. Step 2: Convert to fraction form
   1,006,785.18/1,389,656.31 = 657,978.06/x
3. Step 3: Cross multiply
   1,006,785.18x = 1,389,656.31 × 657,978.06
4. Step 4: Simplify right side
   1,006,785.18x = 914,363,362,920.56
5. Step 5: Solve for x
   x = 914,363,362,920.56/1,006,785.18
6. Step 6: Final answer
   x = 908,201.06