Finding the Fourth Proportional to 2,706.18, 4,057.83 and 856.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,706.18 : 4,057.83 = 856.80 : x
2. Step 2: Convert to fraction form
   2,706.18/4,057.83 = 856.80/x
3. Step 3: Cross multiply
   2,706.18x = 4,057.83 × 856.80
4. Step 4: Simplify right side
   2,706.18x = 3,476,748.74
5. Step 5: Solve for x
   x = 3,476,748.74/2,706.18
6. Step 6: Final answer
   x = 1,284.74