Finding the Fourth Proportional to 1,115,705.37, 1,540,414.89 and 857,121.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,115,705.37 : 1,540,414.89 = 857,121.78 : x
2. Step 2: Convert to fraction form
   1,115,705.37/1,540,414.89 = 857,121.78/x
3. Step 3: Cross multiply
   1,115,705.37x = 1,540,414.89 × 857,121.78
4. Step 4: Simplify right side
   1,115,705.37x = 1,320,323,152,455.30
5. Step 5: Solve for x
   x = 1,320,323,152,455.30/1,115,705.37
6. Step 6: Final answer
   x = 1,183,397.69