Finding the Fourth Proportional to 31,418.45, 43,340.15 and 19,912.31

Step by Step Solution

1. Step 1: Write the proportion equation
   31,418.45 : 43,340.15 = 19,912.31 : x
2. Step 2: Convert to fraction form
   31,418.45/43,340.15 = 19,912.31/x
3. Step 3: Cross multiply
   31,418.45x = 43,340.15 × 19,912.31
4. Step 4: Simplify right side
   31,418.45x = 863,002,285.55
5. Step 5: Solve for x
   x = 863,002,285.55/31,418.45
6. Step 6: Final answer
   x = 27,468.01