Finding the Fourth Proportional to 20,866.48, 31,142.96 and 18,042.82

Step by Step Solution

1. Step 1: Write the proportion equation
   20,866.48 : 31,142.96 = 18,042.82 : x
2. Step 2: Convert to fraction form
   20,866.48/31,142.96 = 18,042.82/x
3. Step 3: Cross multiply
   20,866.48x = 31,142.96 × 18,042.82
4. Step 4: Simplify right side
   20,866.48x = 561,906,821.55
5. Step 5: Solve for x
   x = 561,906,821.55/20,866.48
6. Step 6: Final answer
   x = 26,928.68