Finding the Fourth Proportional to 16,839.75, 23,238.55 and 9,286.78

Step by Step Solution

1. Step 1: Write the proportion equation
   16,839.75 : 23,238.55 = 9,286.78 : x
2. Step 2: Convert to fraction form
   16,839.75/23,238.55 = 9,286.78/x
3. Step 3: Cross multiply
   16,839.75x = 23,238.55 × 9,286.78
4. Step 4: Simplify right side
   16,839.75x = 215,811,180.86
5. Step 5: Solve for x
   x = 215,811,180.86/16,839.75
6. Step 6: Final answer
   x = 12,815.58