Finding the Fourth Proportional to 8,085.92, 12,106.39 and 4,128.63

Step by Step Solution

1. Step 1: Write the proportion equation
   8,085.92 : 12,106.39 = 4,128.63 : x
2. Step 2: Convert to fraction form
   8,085.92/12,106.39 = 4,128.63/x
3. Step 3: Cross multiply
   8,085.92x = 12,106.39 × 4,128.63
4. Step 4: Simplify right side
   8,085.92x = 49,982,784.30
5. Step 5: Solve for x
   x = 49,982,784.30/8,085.92
6. Step 6: Final answer
   x = 6,181.46