Finding the Fourth Proportional to 31,822.18, 43,921.10 and 18,391.57

Step by Step Solution

1. Step 1: Write the proportion equation
   31,822.18 : 43,921.10 = 18,391.57 : x
2. Step 2: Convert to fraction form
   31,822.18/43,921.10 = 18,391.57/x
3. Step 3: Cross multiply
   31,822.18x = 43,921.10 × 18,391.57
4. Step 4: Simplify right side
   31,822.18x = 807,777,921.30
5. Step 5: Solve for x
   x = 807,777,921.30/31,822.18
6. Step 6: Final answer
   x = 25,384.12