Finding the Fourth Proportional to 31,251.96, 43,128 and 17,105.09

Step by Step Solution

1. Step 1: Write the proportion equation
   31,251.96 : 43,128 = 17,105.09 : x
2. Step 2: Convert to fraction form
   31,251.96/43,128 = 17,105.09/x
3. Step 3: Cross multiply
   31,251.96x = 43,128 × 17,105.09
4. Step 4: Simplify right side
   31,251.96x = 737,708,105.88
5. Step 5: Solve for x
   x = 737,708,105.88/31,251.96
6. Step 6: Final answer
   x = 23,605.18