Finding the Fourth Proportional to 23,131.14, 31,920.66 and 12,520.56

Step by Step Solution

1. Step 1: Write the proportion equation
   23,131.14 : 31,920.66 = 12,520.56 : x
2. Step 2: Convert to fraction form
   23,131.14/31,920.66 = 12,520.56/x
3. Step 3: Cross multiply
   23,131.14x = 31,920.66 × 12,520.56
4. Step 4: Simplify right side
   23,131.14x = 399,664,538.77
5. Step 5: Solve for x
   x = 399,664,538.77/23,131.14
6. Step 6: Final answer
   x = 17,278.20