Finding the Fourth Proportional to 31,681.59, 43,731.52 and 18,258.20

Step by Step Solution

1. Step 1: Write the proportion equation
   31,681.59 : 43,731.52 = 18,258.20 : x
2. Step 2: Convert to fraction form
   31,681.59/43,731.52 = 18,258.20/x
3. Step 3: Cross multiply
   31,681.59x = 43,731.52 × 18,258.20
4. Step 4: Simplify right side
   31,681.59x = 798,458,738.15
5. Step 5: Solve for x
   x = 798,458,738.15/31,681.59
6. Step 6: Final answer
   x = 25,202.61