Finding the Fourth Proportional to 3,912.63, 5,399.31 and 2,144.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,912.63 : 5,399.31 = 2,144.20 : x
2. Step 2: Convert to fraction form
   3,912.63/5,399.31 = 2,144.20/x
3. Step 3: Cross multiply
   3,912.63x = 5,399.31 × 2,144.20
4. Step 4: Simplify right side
   3,912.63x = 11,577,200.50
5. Step 5: Solve for x
   x = 11,577,200.50/3,912.63
6. Step 6: Final answer
   x = 2,958.93