Finding the Fourth Proportional to 8,105.85, 12,156.93 and 2,911.71

Step by Step Solution

1. Step 1: Write the proportion equation
   8,105.85 : 12,156.93 = 2,911.71 : x
2. Step 2: Convert to fraction form
   8,105.85/12,156.93 = 2,911.71/x
3. Step 3: Cross multiply
   8,105.85x = 12,156.93 × 2,911.71
4. Step 4: Simplify right side
   8,105.85x = 35,397,454.65
5. Step 5: Solve for x
   x = 35,397,454.65/8,105.85
6. Step 6: Final answer
   x = 4,366.90