Finding the Fourth Proportional to 12,442.48, 18,648.24 and 8,278.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,442.48 : 18,648.24 = 8,278.72 : x
2. Step 2: Convert to fraction form
   12,442.48/18,648.24 = 8,278.72/x
3. Step 3: Cross multiply
   12,442.48x = 18,648.24 × 8,278.72
4. Step 4: Simplify right side
   12,442.48x = 154,383,557.45
5. Step 5: Solve for x
   x = 154,383,557.45/12,442.48
6. Step 6: Final answer
   x = 12,407.78