Finding the Fourth Proportional to 2,288.28, 3,157.83 and 1,240.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,288.28 : 3,157.83 = 1,240.34 : x
2. Step 2: Convert to fraction form
   2,288.28/3,157.83 = 1,240.34/x
3. Step 3: Cross multiply
   2,288.28x = 3,157.83 × 1,240.34
4. Step 4: Simplify right side
   2,288.28x = 3,916,782.86
5. Step 5: Solve for x
   x = 3,916,782.86/2,288.28
6. Step 6: Final answer
   x = 1,711.67