Finding the Fourth Proportional to 2,287.28, 3,156.39 and 1,292.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,287.28 : 3,156.39 = 1,292.60 : x
2. Step 2: Convert to fraction form
   2,287.28/3,156.39 = 1,292.60/x
3. Step 3: Cross multiply
   2,287.28x = 3,156.39 × 1,292.60
4. Step 4: Simplify right side
   2,287.28x = 4,079,938.78
5. Step 5: Solve for x
   x = 4,079,938.78/2,287.28
6. Step 6: Final answer
   x = 1,783.76