Finding the Fourth Proportional to 2,057.90, 3,087.34 and 671.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.90 : 3,087.34 = 671.25 : x
2. Step 2: Convert to fraction form
   2,057.90/3,087.34 = 671.25/x
3. Step 3: Cross multiply
   2,057.90x = 3,087.34 × 671.25
4. Step 4: Simplify right side
   2,057.90x = 2,072,361.54
5. Step 5: Solve for x
   x = 2,072,361.54/2,057.90
6. Step 6: Final answer
   x = 1,007.03