Finding the Fourth Proportional to 23,171.20, 31,976.42 and 12,561

Step by Step Solution

1. Step 1: Write the proportion equation
   23,171.20 : 31,976.42 = 12,561 : x
2. Step 2: Convert to fraction form
   23,171.20/31,976.42 = 12,561/x
3. Step 3: Cross multiply
   23,171.20x = 31,976.42 × 12,561
4. Step 4: Simplify right side
   23,171.20x = 401,655,811.62
5. Step 5: Solve for x
   x = 401,655,811.62/23,171.20
6. Step 6: Final answer
   x = 17,334.27