Finding the Fourth Proportional to 10,615.31, 14,648.78 and 6,139.25

Step by Step Solution

1. Step 1: Write the proportion equation
   10,615.31 : 14,648.78 = 6,139.25 : x
2. Step 2: Convert to fraction form
   10,615.31/14,648.78 = 6,139.25/x
3. Step 3: Cross multiply
   10,615.31x = 14,648.78 × 6,139.25
4. Step 4: Simplify right side
   10,615.31x = 89,932,418.67
5. Step 5: Solve for x
   x = 89,932,418.67/10,615.31
6. Step 6: Final answer
   x = 8,471.96