Finding the Fourth Proportional to 2,076.28, 2,865.30 and 1,144.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,076.28 : 2,865.30 = 1,144.78 : x
2. Step 2: Convert to fraction form
   2,076.28/2,865.30 = 1,144.78/x
3. Step 3: Cross multiply
   2,076.28x = 2,865.30 × 1,144.78
4. Step 4: Simplify right side
   2,076.28x = 3,280,138.13
5. Step 5: Solve for x
   x = 3,280,138.13/2,076.28
6. Step 6: Final answer
   x = 1,579.81