Finding the Fourth Proportional to 8,086.17, 12,106.76 and 4,128.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,086.17 : 12,106.76 = 4,128.89 : x
2. Step 2: Convert to fraction form
   8,086.17/12,106.76 = 4,128.89/x
3. Step 3: Cross multiply
   8,086.17x = 12,106.76 × 4,128.89
4. Step 4: Simplify right side
   8,086.17x = 49,987,399.12
5. Step 5: Solve for x
   x = 49,987,399.12/8,086.17
6. Step 6: Final answer
   x = 6,181.84