Finding the Fourth Proportional to 8,085.10, 12,139.80 and 6,238.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,085.10 : 12,139.80 = 6,238.30 : x
2. Step 2: Convert to fraction form
   8,085.10/12,139.80 = 6,238.30/x
3. Step 3: Cross multiply
   8,085.10x = 12,139.80 × 6,238.30
4. Step 4: Simplify right side
   8,085.10x = 75,731,714.34
5. Step 5: Solve for x
   x = 75,731,714.34/8,085.10
6. Step 6: Final answer
   x = 9,366.82