Finding the Fourth Proportional to 2,105.53, 3,158.22 and 718.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.53 : 3,158.22 = 718.91 : x
2. Step 2: Convert to fraction form
   2,105.53/3,158.22 = 718.91/x
3. Step 3: Cross multiply
   2,105.53x = 3,158.22 × 718.91
4. Step 4: Simplify right side
   2,105.53x = 2,270,475.94
5. Step 5: Solve for x
   x = 2,270,475.94/2,105.53
6. Step 6: Final answer
   x = 1,078.34