Finding the Fourth Proportional to 2,706.09, 4,057.59 and 857.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,706.09 : 4,057.59 = 857.67 : x
2. Step 2: Convert to fraction form
   2,706.09/4,057.59 = 857.67/x
3. Step 3: Cross multiply
   2,706.09x = 4,057.59 × 857.67
4. Step 4: Simplify right side
   2,706.09x = 3,480,073.22
5. Step 5: Solve for x
   x = 3,480,073.22/2,706.09
6. Step 6: Final answer
   x = 1,286.02