Finding the Fourth Proportional to 2,288.88, 3,158.67 and 1,240.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,288.88 : 3,158.67 = 1,240.96 : x
2. Step 2: Convert to fraction form
   2,288.88/3,158.67 = 1,240.96/x
3. Step 3: Cross multiply
   2,288.88x = 3,158.67 × 1,240.96
4. Step 4: Simplify right side
   2,288.88x = 3,919,783.12
5. Step 5: Solve for x
   x = 3,919,783.12/2,288.88
6. Step 6: Final answer
   x = 1,712.53