Finding the Fourth Proportional to 8,139.62, 12,207.00 and 3,459.61

Step by Step Solution

1. Step 1: Write the proportion equation
   8,139.62 : 12,207.00 = 3,459.61 : x
2. Step 2: Convert to fraction form
   8,139.62/12,207.00 = 3,459.61/x
3. Step 3: Cross multiply
   8,139.62x = 12,207.00 × 3,459.61
4. Step 4: Simplify right side
   8,139.62x = 42,231,487.50
5. Step 5: Solve for x
   x = 42,231,487.50/8,139.62
6. Step 6: Final answer
   x = 5,188.38