Finding the Fourth Proportional to 8,111.16, 12,159.42 and 2,915.82

Step by Step Solution

1. Step 1: Write the proportion equation
   8,111.16 : 12,159.42 = 2,915.82 : x
2. Step 2: Convert to fraction form
   8,111.16/12,159.42 = 2,915.82/x
3. Step 3: Cross multiply
   8,111.16x = 12,159.42 × 2,915.82
4. Step 4: Simplify right side
   8,111.16x = 35,454,680.02
5. Step 5: Solve for x
   x = 35,454,680.02/8,111.16
6. Step 6: Final answer
   x = 4,371.10