Finding the Fourth Proportional to 17,870.40, 24,662.67 and 9,915.20

Step by Step Solution

1. Step 1: Write the proportion equation
   17,870.40 : 24,662.67 = 9,915.20 : x
2. Step 2: Convert to fraction form
   17,870.40/24,662.67 = 9,915.20/x
3. Step 3: Cross multiply
   17,870.40x = 24,662.67 × 9,915.20
4. Step 4: Simplify right side
   17,870.40x = 244,535,182.27
5. Step 5: Solve for x
   x = 244,535,182.27/17,870.40
6. Step 6: Final answer
   x = 13,683.81