Finding the Fourth Proportional to 9,831.42, 13,491.05 and 8,940.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,831.42 : 13,491.05 = 8,940.42 : x
2. Step 2: Convert to fraction form
   9,831.42/13,491.05 = 8,940.42/x
3. Step 3: Cross multiply
   9,831.42x = 13,491.05 × 8,940.42
4. Step 4: Simplify right side
   9,831.42x = 120,615,608.54
5. Step 5: Solve for x
   x = 120,615,608.54/9,831.42
6. Step 6: Final answer
   x = 12,268.38