Finding the Fourth Proportional to 8,131.89, 12,196.31 and 2,585.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,131.89 : 12,196.31 = 2,585.30 : x
2. Step 2: Convert to fraction form
   8,131.89/12,196.31 = 2,585.30/x
3. Step 3: Cross multiply
   8,131.89x = 12,196.31 × 2,585.30
4. Step 4: Simplify right side
   8,131.89x = 31,531,046.33
5. Step 5: Solve for x
   x = 31,531,046.33/8,131.89
6. Step 6: Final answer
   x = 3,877.45