Finding the Fourth Proportional to 2,570.70, 3,855.93 and 839.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,570.70 : 3,855.93 = 839.34 : x
2. Step 2: Convert to fraction form
   2,570.70/3,855.93 = 839.34/x
3. Step 3: Cross multiply
   2,570.70x = 3,855.93 × 839.34
4. Step 4: Simplify right side
   2,570.70x = 3,236,436.29
5. Step 5: Solve for x
   x = 3,236,436.29/2,570.70
6. Step 6: Final answer
   x = 1,258.97