Finding the Fourth Proportional to 20,743.31, 31,114.82 and 12,425.69

Step by Step Solution

1. Step 1: Write the proportion equation
   20,743.31 : 31,114.82 = 12,425.69 : x
2. Step 2: Convert to fraction form
   20,743.31/31,114.82 = 12,425.69/x
3. Step 3: Cross multiply
   20,743.31x = 31,114.82 × 12,425.69
4. Step 4: Simplify right side
   20,743.31x = 386,622,890.02
5. Step 5: Solve for x
   x = 386,622,890.02/20,743.31
6. Step 6: Final answer
   x = 18,638.44