Finding the Fourth Proportional to 31,644.81, 43,671.15 and 18,216.09

Step by Step Solution

1. Step 1: Write the proportion equation
   31,644.81 : 43,671.15 = 18,216.09 : x
2. Step 2: Convert to fraction form
   31,644.81/43,671.15 = 18,216.09/x
3. Step 3: Cross multiply
   31,644.81x = 43,671.15 × 18,216.09
4. Step 4: Simplify right side
   31,644.81x = 795,517,598.80
5. Step 5: Solve for x
   x = 795,517,598.80/31,644.81
6. Step 6: Final answer
   x = 25,138.96