Finding the Fourth Proportional to 23,142.12, 31,936.08 and 12,531.72

Step by Step Solution

1. Step 1: Write the proportion equation
   23,142.12 : 31,936.08 = 12,531.72 : x
2. Step 2: Convert to fraction form
   23,142.12/31,936.08 = 12,531.72/x
3. Step 3: Cross multiply
   23,142.12x = 31,936.08 × 12,531.72
4. Step 4: Simplify right side
   23,142.12x = 400,214,012.46
5. Step 5: Solve for x
   x = 400,214,012.46/23,142.12
6. Step 6: Final answer
   x = 17,293.75