Finding the Fourth Proportional to 8,839.76, 12,218.37 and 7,769.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,839.76 : 12,218.37 = 7,769.50 : x
2. Step 2: Convert to fraction form
   8,839.76/12,218.37 = 7,769.50/x
3. Step 3: Cross multiply
   8,839.76x = 12,218.37 × 7,769.50
4. Step 4: Simplify right side
   8,839.76x = 94,930,625.72
5. Step 5: Solve for x
   x = 94,930,625.72/8,839.76
6. Step 6: Final answer
   x = 10,739.05