Finding the Fourth Proportional to 17,696.72, 24,407.78 and 12,915.96

Step by Step Solution

1. Step 1: Write the proportion equation
   17,696.72 : 24,407.78 = 12,915.96 : x
2. Step 2: Convert to fraction form
   17,696.72/24,407.78 = 12,915.96/x
3. Step 3: Cross multiply
   17,696.72x = 24,407.78 × 12,915.96
4. Step 4: Simplify right side
   17,696.72x = 315,249,910.17
5. Step 5: Solve for x
   x = 315,249,910.17/17,696.72
6. Step 6: Final answer
   x = 17,814.03