Finding the Fourth Proportional to 17,870.79, 24,664.64 and 9,915.57

Step by Step Solution

1. Step 1: Write the proportion equation
   17,870.79 : 24,664.64 = 9,915.57 : x
2. Step 2: Convert to fraction form
   17,870.79/24,664.64 = 9,915.57/x
3. Step 3: Cross multiply
   17,870.79x = 24,664.64 × 9,915.57
4. Step 4: Simplify right side
   17,870.79x = 244,563,914.87
5. Step 5: Solve for x
   x = 244,563,914.87/17,870.79
6. Step 6: Final answer
   x = 13,685.12