Finding the Fourth Proportional to 20,778.72, 31,168.71 and 8,127.97

Step by Step Solution

1. Step 1: Write the proportion equation
   20,778.72 : 31,168.71 = 8,127.97 : x
2. Step 2: Convert to fraction form
   20,778.72/31,168.71 = 8,127.97/x
3. Step 3: Cross multiply
   20,778.72x = 31,168.71 × 8,127.97
4. Step 4: Simplify right side
   20,778.72x = 253,338,339.82
5. Step 5: Solve for x
   x = 253,338,339.82/20,778.72
6. Step 6: Final answer
   x = 12,192.20