Finding the Fourth Proportional to 8,928.72, 12,320.50 and 4,949.80

Step by Step Solution

1. Step 1: Write the proportion equation
   8,928.72 : 12,320.50 = 4,949.80 : x
2. Step 2: Convert to fraction form
   8,928.72/12,320.50 = 4,949.80/x
3. Step 3: Cross multiply
   8,928.72x = 12,320.50 × 4,949.80
4. Step 4: Simplify right side
   8,928.72x = 60,984,010.90
5. Step 5: Solve for x
   x = 60,984,010.90/8,928.72
6. Step 6: Final answer
   x = 6,830.10