Finding the Fourth Proportional to 20,722.47, 31,061.69 and 14,132.31

Step by Step Solution

1. Step 1: Write the proportion equation
   20,722.47 : 31,061.69 = 14,132.31 : x
2. Step 2: Convert to fraction form
   20,722.47/31,061.69 = 14,132.31/x
3. Step 3: Cross multiply
   20,722.47x = 31,061.69 × 14,132.31
4. Step 4: Simplify right side
   20,722.47x = 438,973,361.54
5. Step 5: Solve for x
   x = 438,973,361.54/20,722.47
6. Step 6: Final answer
   x = 21,183.45