Finding the Fourth Proportional to 8,839.89, 13,257 and 8,257.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,839.89 : 13,257 = 8,257.50 : x
2. Step 2: Convert to fraction form
   8,839.89/13,257 = 8,257.50/x
3. Step 3: Cross multiply
   8,839.89x = 13,257 × 8,257.50
4. Step 4: Simplify right side
   8,839.89x = 109,469,677.50
5. Step 5: Solve for x
   x = 109,469,677.50/8,839.89
6. Step 6: Final answer
   x = 12,383.60