Finding the Fourth Proportional to 8,139.36, 12,208.77 and 5,508.09

Step by Step Solution

1. Step 1: Write the proportion equation
   8,139.36 : 12,208.77 = 5,508.09 : x
2. Step 2: Convert to fraction form
   8,139.36/12,208.77 = 5,508.09/x
3. Step 3: Cross multiply
   8,139.36x = 12,208.77 × 5,508.09
4. Step 4: Simplify right side
   8,139.36x = 67,247,003.95
5. Step 5: Solve for x
   x = 67,247,003.95/8,139.36
6. Step 6: Final answer
   x = 8,261.95