Finding the Fourth Proportional to 8,210.32, 12,310.56 and 3,280.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,210.32 : 12,310.56 = 3,280.72 : x
2. Step 2: Convert to fraction form
   8,210.32/12,310.56 = 3,280.72/x
3. Step 3: Cross multiply
   8,210.32x = 12,310.56 × 3,280.72
4. Step 4: Simplify right side
   8,210.32x = 40,387,500.40
5. Step 5: Solve for x
   x = 40,387,500.40/8,210.32
6. Step 6: Final answer
   x = 4,919.11