Finding the Fourth Proportional to 3,665.55, 5,057.49 and 2,172.24

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.55 : 5,057.49 = 2,172.24 : x
2. Step 2: Convert to fraction form
   3,665.55/5,057.49 = 2,172.24/x
3. Step 3: Cross multiply
   3,665.55x = 5,057.49 × 2,172.24
4. Step 4: Simplify right side
   3,665.55x = 10,986,082.08
5. Step 5: Solve for x
   x = 10,986,082.08/3,665.55
6. Step 6: Final answer
   x = 2,997.12