Finding the Fourth Proportional to 23,128.15, 31,916.79 and 12,517.96

Step by Step Solution

1. Step 1: Write the proportion equation
   23,128.15 : 31,916.79 = 12,517.96 : x
2. Step 2: Convert to fraction form
   23,128.15/31,916.79 = 12,517.96/x
3. Step 3: Cross multiply
   23,128.15x = 31,916.79 × 12,517.96
4. Step 4: Simplify right side
   23,128.15x = 399,533,100.55
5. Step 5: Solve for x
   x = 399,533,100.55/23,128.15
6. Step 6: Final answer
   x = 17,274.75