Finding the Fourth Proportional to 2,288.69, 3,158.39 and 1,240.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,288.69 : 3,158.39 = 1,240.75 : x
2. Step 2: Convert to fraction form
   2,288.69/3,158.39 = 1,240.75/x
3. Step 3: Cross multiply
   2,288.69x = 3,158.39 × 1,240.75
4. Step 4: Simplify right side
   2,288.69x = 3,918,756.60
5. Step 5: Solve for x
   x = 3,918,756.60/2,288.69
6. Step 6: Final answer
   x = 1,712.23