Finding the Fourth Proportional to 31,579.92, 43,578.81 and 18,141.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,579.92 : 43,578.81 = 18,141.72 : x
2. Step 2: Convert to fraction form
   31,579.92/43,578.81 = 18,141.72/x
3. Step 3: Cross multiply
   31,579.92x = 43,578.81 × 18,141.72
4. Step 4: Simplify right side
   31,579.92x = 790,594,568.95
5. Step 5: Solve for x
   x = 790,594,568.95/31,579.92
6. Step 6: Final answer
   x = 25,034.72