Finding the Fourth Proportional to 2,105.48, 3,158.69 and 718.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.48 : 3,158.69 = 718.76 : x
2. Step 2: Convert to fraction form
   2,105.48/3,158.69 = 718.76/x
3. Step 3: Cross multiply
   2,105.48x = 3,158.69 × 718.76
4. Step 4: Simplify right side
   2,105.48x = 2,270,320.64
5. Step 5: Solve for x
   x = 2,270,320.64/2,105.48
6. Step 6: Final answer
   x = 1,078.29