Finding the Fourth Proportional to 3,439.49, 5,147.57 and 2,124.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,439.49 : 5,147.57 = 2,124.12 : x
2. Step 2: Convert to fraction form
   3,439.49/5,147.57 = 2,124.12/x
3. Step 3: Cross multiply
   3,439.49x = 5,147.57 × 2,124.12
4. Step 4: Simplify right side
   3,439.49x = 10,934,061.70
5. Step 5: Solve for x
   x = 10,934,061.70/3,439.49
6. Step 6: Final answer
   x = 3,178.98