Finding the Fourth Proportional to 2,144.40, 3,215.52 and 989.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,144.40 : 3,215.52 = 989.52 : x
2. Step 2: Convert to fraction form
   2,144.40/3,215.52 = 989.52/x
3. Step 3: Cross multiply
   2,144.40x = 3,215.52 × 989.52
4. Step 4: Simplify right side
   2,144.40x = 3,181,821.35
5. Step 5: Solve for x
   x = 3,181,821.35/2,144.40
6. Step 6: Final answer
   x = 1,483.78