Finding the Fourth Proportional to 2,229.72, 3,076.63 and 1,285.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,229.72 : 3,076.63 = 1,285.40 : x
2. Step 2: Convert to fraction form
   2,229.72/3,076.63 = 1,285.40/x
3. Step 3: Cross multiply
   2,229.72x = 3,076.63 × 1,285.40
4. Step 4: Simplify right side
   2,229.72x = 3,954,700.20
5. Step 5: Solve for x
   x = 3,954,700.20/2,229.72
6. Step 6: Final answer
   x = 1,773.63