Finding the Fourth Proportional to 2,658,841.89, 3,987,426.30 and 861,308.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,658,841.89 : 3,987,426.30 = 861,308.31 : x
2. Step 2: Convert to fraction form
   2,658,841.89/3,987,426.30 = 861,308.31/x
3. Step 3: Cross multiply
   2,658,841.89x = 3,987,426.30 × 861,308.31
4. Step 4: Simplify right side
   2,658,841.89x = 3,434,403,419,425.50
5. Step 5: Solve for x
   x = 3,434,403,419,425.50/2,658,841.89
6. Step 6: Final answer
   x = 1,291,691.48