Finding the Fourth Proportional to 12,760.72, 17,610 and 7,724.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,760.72 : 17,610 = 7,724.88 : x
2. Step 2: Convert to fraction form
   12,760.72/17,610 = 7,724.88/x
3. Step 3: Cross multiply
   12,760.72x = 17,610 × 7,724.88
4. Step 4: Simplify right side
   12,760.72x = 136,035,136.80
5. Step 5: Solve for x
   x = 136,035,136.80/12,760.72
6. Step 6: Final answer
   x = 10,660.46