Finding the Fourth Proportional to 2,288.23, 3,157.72 and 1,240.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,288.23 : 3,157.72 = 1,240.28 : x
2. Step 2: Convert to fraction form
   2,288.23/3,157.72 = 1,240.28/x
3. Step 3: Cross multiply
   2,288.23x = 3,157.72 × 1,240.28
4. Step 4: Simplify right side
   2,288.23x = 3,916,456.96
5. Step 5: Solve for x
   x = 3,916,456.96/2,288.23
6. Step 6: Final answer
   x = 1,711.57