Finding the Fourth Proportional to 2,289.02, 3,158.78 and 1,294.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,289.02 : 3,158.78 = 1,294.40 : x
2. Step 2: Convert to fraction form
   2,289.02/3,158.78 = 1,294.40/x
3. Step 3: Cross multiply
   2,289.02x = 3,158.78 × 1,294.40
4. Step 4: Simplify right side
   2,289.02x = 4,088,724.83
5. Step 5: Solve for x
   x = 4,088,724.83/2,289.02
6. Step 6: Final answer
   x = 1,786.23