Finding the Fourth Proportional to 8,078.29, 12,112.47 and 3,142.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,078.29 : 12,112.47 = 3,142.18 : x
2. Step 2: Convert to fraction form
   8,078.29/12,112.47 = 3,142.18/x
3. Step 3: Cross multiply
   8,078.29x = 12,112.47 × 3,142.18
4. Step 4: Simplify right side
   8,078.29x = 38,059,500.42
5. Step 5: Solve for x
   x = 38,059,500.42/8,078.29
6. Step 6: Final answer
   x = 4,711.33