Finding the Fourth Proportional to 8,429.31, 12,645.89 and 2,585.55

Step by Step Solution

1. Step 1: Write the proportion equation
   8,429.31 : 12,645.89 = 2,585.55 : x
2. Step 2: Convert to fraction form
   8,429.31/12,645.89 = 2,585.55/x
3. Step 3: Cross multiply
   8,429.31x = 12,645.89 × 2,585.55
4. Step 4: Simplify right side
   8,429.31x = 32,696,567.96
5. Step 5: Solve for x
   x = 32,696,567.96/8,429.31
6. Step 6: Final answer
   x = 3,878.91