Finding the Fourth Proportional to 3,911.56, 5,397.89 and 2,143.16

Step by Step Solution

1. Step 1: Write the proportion equation
   3,911.56 : 5,397.89 = 2,143.16 : x
2. Step 2: Convert to fraction form
   3,911.56/5,397.89 = 2,143.16/x
3. Step 3: Cross multiply
   3,911.56x = 5,397.89 × 2,143.16
4. Step 4: Simplify right side
   3,911.56x = 11,568,566.89
5. Step 5: Solve for x
   x = 11,568,566.89/3,911.56
6. Step 6: Final answer
   x = 2,957.53