Finding the Fourth Proportional to 2,658,843.88, 3,987,429.30 and 861,310.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,658,843.88 : 3,987,429.30 = 861,310.32 : x
2. Step 2: Convert to fraction form
   2,658,843.88/3,987,429.30 = 861,310.32/x
3. Step 3: Cross multiply
   2,658,843.88x = 3,987,429.30 × 861,310.32
4. Step 4: Simplify right side
   2,658,843.88x = 3,434,414,006,360.38
5. Step 5: Solve for x
   x = 3,434,414,006,360.38/2,658,843.88
6. Step 6: Final answer
   x = 1,291,694.50