Finding the Fourth Proportional to 12,399.52, 17,113.76 and 7,685.92

Step by Step Solution

1. Step 1: Write the proportion equation
   12,399.52 : 17,113.76 = 7,685.92 : x
2. Step 2: Convert to fraction form
   12,399.52/17,113.76 = 7,685.92/x
3. Step 3: Cross multiply
   12,399.52x = 17,113.76 × 7,685.92
4. Step 4: Simplify right side
   12,399.52x = 131,534,990.26
5. Step 5: Solve for x
   x = 131,534,990.26/12,399.52
6. Step 6: Final answer
   x = 10,608.07