Finding the Fourth Proportional to 17,677.72, 24,395.88 and 9,720.55

Step by Step Solution

1. Step 1: Write the proportion equation
   17,677.72 : 24,395.88 = 9,720.55 : x
2. Step 2: Convert to fraction form
   17,677.72/24,395.88 = 9,720.55/x
3. Step 3: Cross multiply
   17,677.72x = 24,395.88 × 9,720.55
4. Step 4: Simplify right side
   17,677.72x = 237,141,371.33
5. Step 5: Solve for x
   x = 237,141,371.33/17,677.72
6. Step 6: Final answer
   x = 13,414.70