Finding the Fourth Proportional to 23,131.10, 31,921.08 and 12,520.82

Step by Step Solution

1. Step 1: Write the proportion equation
   23,131.10 : 31,921.08 = 12,520.82 : x
2. Step 2: Convert to fraction form
   23,131.10/31,921.08 = 12,520.82/x
3. Step 3: Cross multiply
   23,131.10x = 31,921.08 × 12,520.82
4. Step 4: Simplify right side
   23,131.10x = 399,678,096.89
5. Step 5: Solve for x
   x = 399,678,096.89/23,131.10
6. Step 6: Final answer
   x = 17,278.82