Finding the Fourth Proportional to 2,288.50, 3,158.10 and 1,240.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,288.50 : 3,158.10 = 1,240.60 : x
2. Step 2: Convert to fraction form
   2,288.50/3,158.10 = 1,240.60/x
3. Step 3: Cross multiply
   2,288.50x = 3,158.10 × 1,240.60
4. Step 4: Simplify right side
   2,288.50x = 3,917,938.86
5. Step 5: Solve for x
   x = 3,917,938.86/2,288.50
6. Step 6: Final answer
   x = 1,712.01