Finding the Fourth Proportional to 3,876.24, 5,811.12 and 2,640.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3,876.24 : 5,811.12 = 2,640.18 : x
2. Step 2: Convert to fraction form
   3,876.24/5,811.12 = 2,640.18/x
3. Step 3: Cross multiply
   3,876.24x = 5,811.12 × 2,640.18
4. Step 4: Simplify right side
   3,876.24x = 15,342,402.80
5. Step 5: Solve for x
   x = 15,342,402.80/3,876.24
6. Step 6: Final answer
   x = 3,958.06