Finding the Fourth Proportional to 2,658,843.89, 3,987,429.30 and 861,310.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,658,843.89 : 3,987,429.30 = 861,310.31 : x
2. Step 2: Convert to fraction form
   2,658,843.89/3,987,429.30 = 861,310.31/x
3. Step 3: Cross multiply
   2,658,843.89x = 3,987,429.30 × 861,310.31
4. Step 4: Simplify right side
   2,658,843.89x = 3,434,413,966,486.08
5. Step 5: Solve for x
   x = 3,434,413,966,486.08/2,658,843.89
6. Step 6: Final answer
   x = 1,291,694.48