Finding the Fourth Proportional to 21,831.77, 30,139.31 and 14,699.19

Step by Step Solution

1. Step 1: Write the proportion equation
   21,831.77 : 30,139.31 = 14,699.19 : x
2. Step 2: Convert to fraction form
   21,831.77/30,139.31 = 14,699.19/x
3. Step 3: Cross multiply
   21,831.77x = 30,139.31 × 14,699.19
4. Step 4: Simplify right side
   21,831.77x = 443,023,480.91
5. Step 5: Solve for x
   x = 443,023,480.91/21,831.77
6. Step 6: Final answer
   x = 20,292.60