Finding the Fourth Proportional to 2,570.67, 3,855.96 and 839.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,570.67 : 3,855.96 = 839.25 : x
2. Step 2: Convert to fraction form
   2,570.67/3,855.96 = 839.25/x
3. Step 3: Cross multiply
   2,570.67x = 3,855.96 × 839.25
4. Step 4: Simplify right side
   2,570.67x = 3,236,114.43
5. Step 5: Solve for x
   x = 3,236,114.43/2,570.67
6. Step 6: Final answer
   x = 1,258.86