Finding the Fourth Proportional to 21,831.93, 30,128.76 and 12,401.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,831.93 : 30,128.76 = 12,401.10 : x
2. Step 2: Convert to fraction form
   21,831.93/30,128.76 = 12,401.10/x
3. Step 3: Cross multiply
   21,831.93x = 30,128.76 × 12,401.10
4. Step 4: Simplify right side
   21,831.93x = 373,629,765.64
5. Step 5: Solve for x
   x = 373,629,765.64/21,831.93
6. Step 6: Final answer
   x = 17,113.91