Finding the Fourth Proportional to 7,105.85, 10,661.85 and 3,815.10

Step by Step Solution

1. Step 1: Write the proportion equation
   7,105.85 : 10,661.85 = 3,815.10 : x
2. Step 2: Convert to fraction form
   7,105.85/10,661.85 = 3,815.10/x
3. Step 3: Cross multiply
   7,105.85x = 10,661.85 × 3,815.10
4. Step 4: Simplify right side
   7,105.85x = 40,676,004.86
5. Step 5: Solve for x
   x = 40,676,004.86/7,105.85
6. Step 6: Final answer
   x = 5,724.30