Finding the Fourth Proportional to 12,724.68, 17,560.52 and 7,687.92

Step by Step Solution

1. Step 1: Write the proportion equation
   12,724.68 : 17,560.52 = 7,687.92 : x
2. Step 2: Convert to fraction form
   12,724.68/17,560.52 = 7,687.92/x
3. Step 3: Cross multiply
   12,724.68x = 17,560.52 × 7,687.92
4. Step 4: Simplify right side
   12,724.68x = 135,003,895.59
5. Step 5: Solve for x
   x = 135,003,895.59/12,724.68
6. Step 6: Final answer
   x = 10,609.61