Finding the Fourth Proportional to 2,288.85, 3,158.78 and 1,294.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,288.85 : 3,158.78 = 1,294.31 : x
2. Step 2: Convert to fraction form
   2,288.85/3,158.78 = 1,294.31/x
3. Step 3: Cross multiply
   2,288.85x = 3,158.78 × 1,294.31
4. Step 4: Simplify right side
   2,288.85x = 4,088,440.54
5. Step 5: Solve for x
   x = 4,088,440.54/2,288.85
6. Step 6: Final answer
   x = 1,786.24