Finding the Fourth Proportional to 20,831.36, 28,738.14 and 12,443

Step by Step Solution

1. Step 1: Write the proportion equation
   20,831.36 : 28,738.14 = 12,443 : x
2. Step 2: Convert to fraction form
   20,831.36/28,738.14 = 12,443/x
3. Step 3: Cross multiply
   20,831.36x = 28,738.14 × 12,443
4. Step 4: Simplify right side
   20,831.36x = 357,588,676.02
5. Step 5: Solve for x
   x = 357,588,676.02/20,831.36
6. Step 6: Final answer
   x = 17,165.88