Finding the Fourth Proportional to 31,581.51, 43,591.62 and 18,672.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,581.51 : 43,591.62 = 18,672.72 : x
2. Step 2: Convert to fraction form
   31,581.51/43,591.62 = 18,672.72/x
3. Step 3: Cross multiply
   31,581.51x = 43,591.62 × 18,672.72
4. Step 4: Simplify right side
   31,581.51x = 813,974,114.61
5. Step 5: Solve for x
   x = 813,974,114.61/31,581.51
6. Step 6: Final answer
   x = 25,773.76