Finding the Fourth Proportional to 3,872.77, 5,811.86 and 2,311.79

Step by Step Solution

1. Step 1: Write the proportion equation
   3,872.77 : 5,811.86 = 2,311.79 : x
2. Step 2: Convert to fraction form
   3,872.77/5,811.86 = 2,311.79/x
3. Step 3: Cross multiply
   3,872.77x = 5,811.86 × 2,311.79
4. Step 4: Simplify right side
   3,872.77x = 13,435,776.55
5. Step 5: Solve for x
   x = 13,435,776.55/3,872.77
6. Step 6: Final answer
   x = 3,469.30