Finding the Fourth Proportional to 3,912.59, 5,399.39 and 2,144.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,912.59 : 5,399.39 = 2,144.30 : x
2. Step 2: Convert to fraction form
   3,912.59/5,399.39 = 2,144.30/x
3. Step 3: Cross multiply
   3,912.59x = 5,399.39 × 2,144.30
4. Step 4: Simplify right side
   3,912.59x = 11,577,890.34
5. Step 5: Solve for x
   x = 11,577,890.34/3,912.59
6. Step 6: Final answer
   x = 2,959.14