Finding the Fourth Proportional to 8,101.83, 12,131.69 and 6,939.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,101.83 : 12,131.69 = 6,939.30 : x
2. Step 2: Convert to fraction form
   8,101.83/12,131.69 = 6,939.30/x
3. Step 3: Cross multiply
   8,101.83x = 12,131.69 × 6,939.30
4. Step 4: Simplify right side
   8,101.83x = 84,185,401.72
5. Step 5: Solve for x
   x = 84,185,401.72/8,101.83
6. Step 6: Final answer
   x = 10,390.91