Finding the Fourth Proportional to 8,139.88, 12,209.79 and 3,401.38

Step by Step Solution

1. Step 1: Write the proportion equation
   8,139.88 : 12,209.79 = 3,401.38 : x
2. Step 2: Convert to fraction form
   8,139.88/12,209.79 = 3,401.38/x
3. Step 3: Cross multiply
   8,139.88x = 12,209.79 × 3,401.38
4. Step 4: Simplify right side
   8,139.88x = 41,530,135.51
5. Step 5: Solve for x
   x = 41,530,135.51/8,139.88
6. Step 6: Final answer
   x = 5,102.06