Finding the Fourth Proportional to 20,814.27, 31,229.61 and 9,119.31

Step by Step Solution

1. Step 1: Write the proportion equation
   20,814.27 : 31,229.61 = 9,119.31 : x
2. Step 2: Convert to fraction form
   20,814.27/31,229.61 = 9,119.31/x
3. Step 3: Cross multiply
   20,814.27x = 31,229.61 × 9,119.31
4. Step 4: Simplify right side
   20,814.27x = 284,792,494.77
5. Step 5: Solve for x
   x = 284,792,494.77/20,814.27
6. Step 6: Final answer
   x = 13,682.56