Finding the Fourth Proportional to 2,389.28, 3,580.20 and 2,144.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,389.28 : 3,580.20 = 2,144.48 : x
2. Step 2: Convert to fraction form
   2,389.28/3,580.20 = 2,144.48/x
3. Step 3: Cross multiply
   2,389.28x = 3,580.20 × 2,144.48
4. Step 4: Simplify right side
   2,389.28x = 7,677,667.30
5. Step 5: Solve for x
   x = 7,677,667.30/2,389.28
6. Step 6: Final answer
   x = 3,213.38