Finding the Fourth Proportional to 12,719.92, 17,562.20 and 7,947.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,719.92 : 17,562.20 = 7,947.15 : x
2. Step 2: Convert to fraction form
   12,719.92/17,562.20 = 7,947.15/x
3. Step 3: Cross multiply
   12,719.92x = 17,562.20 × 7,947.15
4. Step 4: Simplify right side
   12,719.92x = 139,569,310.18
5. Step 5: Solve for x
   x = 139,569,310.18/12,719.92
6. Step 6: Final answer
   x = 10,972.50