Finding the Fourth Proportional to 31,601.10, 43,609.41 and 18,171.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,601.10 : 43,609.41 = 18,171.72 : x
2. Step 2: Convert to fraction form
   31,601.10/43,609.41 = 18,171.72/x
3. Step 3: Cross multiply
   31,601.10x = 43,609.41 × 18,171.72
4. Step 4: Simplify right side
   31,601.10x = 792,457,987.89
5. Step 5: Solve for x
   x = 792,457,987.89/31,601.10
6. Step 6: Final answer
   x = 25,076.91