Finding the Fourth Proportional to 2,105.43, 3,157.21 and 718.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.43 : 3,157.21 = 718.38 : x
2. Step 2: Convert to fraction form
   2,105.43/3,157.21 = 718.38/x
3. Step 3: Cross multiply
   2,105.43x = 3,157.21 × 718.38
4. Step 4: Simplify right side
   2,105.43x = 2,268,076.52
5. Step 5: Solve for x
   x = 2,268,076.52/2,105.43
6. Step 6: Final answer
   x = 1,077.25