Finding the Fourth Proportional to 8,155.40, 12,229.25 and 3,160.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,155.40 : 12,229.25 = 3,160.12 : x
2. Step 2: Convert to fraction form
   8,155.40/12,229.25 = 3,160.12/x
3. Step 3: Cross multiply
   8,155.40x = 12,229.25 × 3,160.12
4. Step 4: Simplify right side
   8,155.40x = 38,645,851.14
5. Step 5: Solve for x
   x = 38,645,851.14/8,155.40
6. Step 6: Final answer
   x = 4,738.68