Finding the Fourth Proportional to 2,288.25, 3,157.79 and 1,240.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,288.25 : 3,157.79 = 1,240.31 : x
2. Step 2: Convert to fraction form
   2,288.25/3,157.79 = 1,240.31/x
3. Step 3: Cross multiply
   2,288.25x = 3,157.79 × 1,240.31
4. Step 4: Simplify right side
   2,288.25x = 3,916,640.21
5. Step 5: Solve for x
   x = 3,916,640.21/2,288.25
6. Step 6: Final answer
   x = 1,711.63