Finding the Fourth Proportional to 16,831.72, 23,228.79 and 9,278.05

Step by Step Solution

1. Step 1: Write the proportion equation
   16,831.72 : 23,228.79 = 9,278.05 : x
2. Step 2: Convert to fraction form
   16,831.72/23,228.79 = 9,278.05/x
3. Step 3: Cross multiply
   16,831.72x = 23,228.79 × 9,278.05
4. Step 4: Simplify right side
   16,831.72x = 215,517,875.06
5. Step 5: Solve for x
   x = 215,517,875.06/16,831.72
6. Step 6: Final answer
   x = 12,804.27