Finding the Fourth Proportional to 2,057.98, 3,087.42 and 671.44

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.98 : 3,087.42 = 671.44 : x
2. Step 2: Convert to fraction form
   2,057.98/3,087.42 = 671.44/x
3. Step 3: Cross multiply
   2,057.98x = 3,087.42 × 671.44
4. Step 4: Simplify right side
   2,057.98x = 2,073,017.28
5. Step 5: Solve for x
   x = 2,073,017.28/2,057.98
6. Step 6: Final answer
   x = 1,007.31