Finding the Fourth Proportional to 8,200.69, 12,305.05 and 3,519.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,200.69 : 12,305.05 = 3,519.31 : x
2. Step 2: Convert to fraction form
   8,200.69/12,305.05 = 3,519.31/x
3. Step 3: Cross multiply
   8,200.69x = 12,305.05 × 3,519.31
4. Step 4: Simplify right side
   8,200.69x = 43,305,285.52
5. Step 5: Solve for x
   x = 43,305,285.52/8,200.69
6. Step 6: Final answer
   x = 5,280.69