Finding the Fourth Proportional to 1,439.78, 2,144.48 and 1,433.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.78 : 2,144.48 = 1,433.09 : x
2. Step 2: Convert to fraction form
   1,439.78/2,144.48 = 1,433.09/x
3. Step 3: Cross multiply
   1,439.78x = 2,144.48 × 1,433.09
4. Step 4: Simplify right side
   1,439.78x = 3,073,231.04
5. Step 5: Solve for x
   x = 3,073,231.04/1,439.78
6. Step 6: Final answer
   x = 2,134.52