Finding the Fourth Proportional to 17,685.72, 24,406.94 and 9,728.55

Step by Step Solution

1. Step 1: Write the proportion equation
   17,685.72 : 24,406.94 = 9,728.55 : x
2. Step 2: Convert to fraction form
   17,685.72/24,406.94 = 9,728.55/x
3. Step 3: Cross multiply
   17,685.72x = 24,406.94 × 9,728.55
4. Step 4: Simplify right side
   17,685.72x = 237,444,160.46
5. Step 5: Solve for x
   x = 237,444,160.46/17,685.72
6. Step 6: Final answer
   x = 13,425.76