Finding the Fourth Proportional to 8,472.06, 12,711.72 and 4,092.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,472.06 : 12,711.72 = 4,092.78 : x
2. Step 2: Convert to fraction form
   8,472.06/12,711.72 = 4,092.78/x
3. Step 3: Cross multiply
   8,472.06x = 12,711.72 × 4,092.78
4. Step 4: Simplify right side
   8,472.06x = 52,026,273.38
5. Step 5: Solve for x
   x = 52,026,273.38/8,472.06
6. Step 6: Final answer
   x = 6,140.92