Finding the Fourth Proportional to 2,705.33, 4,057.40 and 856.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,705.33 : 4,057.40 = 856.59 : x
2. Step 2: Convert to fraction form
   2,705.33/4,057.40 = 856.59/x
3. Step 3: Cross multiply
   2,705.33x = 4,057.40 × 856.59
4. Step 4: Simplify right side
   2,705.33x = 3,475,528.27
5. Step 5: Solve for x
   x = 3,475,528.27/2,705.33
6. Step 6: Final answer
   x = 1,284.70