Finding the Fourth Proportional to 17,718.12, 24,450.72 and 10,915.20

Step by Step Solution

1. Step 1: Write the proportion equation
   17,718.12 : 24,450.72 = 10,915.20 : x
2. Step 2: Convert to fraction form
   17,718.12/24,450.72 = 10,915.20/x
3. Step 3: Cross multiply
   17,718.12x = 24,450.72 × 10,915.20
4. Step 4: Simplify right side
   17,718.12x = 266,884,498.94
5. Step 5: Solve for x
   x = 266,884,498.94/17,718.12
6. Step 6: Final answer
   x = 15,062.80