Finding the Fourth Proportional to 8,209.38, 12,309.12 and 3,459.87

Step by Step Solution

1. Step 1: Write the proportion equation
   8,209.38 : 12,309.12 = 3,459.87 : x
2. Step 2: Convert to fraction form
   8,209.38/12,309.12 = 3,459.87/x
3. Step 3: Cross multiply
   8,209.38x = 12,309.12 × 3,459.87
4. Step 4: Simplify right side
   8,209.38x = 42,587,955.01
5. Step 5: Solve for x
   x = 42,587,955.01/8,209.38
6. Step 6: Final answer
   x = 5,187.72