Finding the Fourth Proportional to 8,213.10, 12,311.55 and 3,276.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,213.10 : 12,311.55 = 3,276.15 : x
2. Step 2: Convert to fraction form
   8,213.10/12,311.55 = 3,276.15/x
3. Step 3: Cross multiply
   8,213.10x = 12,311.55 × 3,276.15
4. Step 4: Simplify right side
   8,213.10x = 40,334,484.53
5. Step 5: Solve for x
   x = 40,334,484.53/8,213.10
6. Step 6: Final answer
   x = 4,910.99