Finding the Fourth Proportional to 31,443.68, 43,393.40 and 18,012.09

Step by Step Solution

1. Step 1: Write the proportion equation
   31,443.68 : 43,393.40 = 18,012.09 : x
2. Step 2: Convert to fraction form
   31,443.68/43,393.40 = 18,012.09/x
3. Step 3: Cross multiply
   31,443.68x = 43,393.40 × 18,012.09
4. Step 4: Simplify right side
   31,443.68x = 781,605,736.15
5. Step 5: Solve for x
   x = 781,605,736.15/31,443.68
6. Step 6: Final answer
   x = 24,857.33