Finding the Fourth Proportional to 4,108.78, 5,665.16 and 2,850.91

Step by Step Solution

1. Step 1: Write the proportion equation
   4,108.78 : 5,665.16 = 2,850.91 : x
2. Step 2: Convert to fraction form
   4,108.78/5,665.16 = 2,850.91/x
3. Step 3: Cross multiply
   4,108.78x = 5,665.16 × 2,850.91
4. Step 4: Simplify right side
   4,108.78x = 16,150,847.04
5. Step 5: Solve for x
   x = 16,150,847.04/4,108.78
6. Step 6: Final answer
   x = 3,930.81