Finding the Fourth Proportional to 23,128.66, 31,917.50 and 12,518.31

Step by Step Solution

1. Step 1: Write the proportion equation
   23,128.66 : 31,917.50 = 12,518.31 : x
2. Step 2: Convert to fraction form
   23,128.66/31,917.50 = 12,518.31/x
3. Step 3: Cross multiply
   23,128.66x = 31,917.50 × 12,518.31
4. Step 4: Simplify right side
   23,128.66x = 399,553,159.43
5. Step 5: Solve for x
   x = 399,553,159.43/23,128.66
6. Step 6: Final answer
   x = 17,275.24