Finding the Fourth Proportional to 8,139.83, 12,210.33 and 3,459.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,139.83 : 12,210.33 = 3,459.30 : x
2. Step 2: Convert to fraction form
   8,139.83/12,210.33 = 3,459.30/x
3. Step 3: Cross multiply
   8,139.83x = 12,210.33 × 3,459.30
4. Step 4: Simplify right side
   8,139.83x = 42,239,194.57
5. Step 5: Solve for x
   x = 42,239,194.57/8,139.83
6. Step 6: Final answer
   x = 5,189.20