Finding the Fourth Proportional to 2,137,086.30, 3,206,228.75 and 858,591.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,137,086.30 : 3,206,228.75 = 858,591.55 : x
2. Step 2: Convert to fraction form
   2,137,086.30/3,206,228.75 = 858,591.55/x
3. Step 3: Cross multiply
   2,137,086.30x = 3,206,228.75 × 858,591.55
4. Step 4: Simplify right side
   2,137,086.30x = 2,752,840,894,601.78
5. Step 5: Solve for x
   x = 2,752,840,894,601.78/2,137,086.30
6. Step 6: Final answer
   x = 1,288,128.09