Finding the Fourth Proportional to 2,587.58, 3,882.27 and 856.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,587.58 : 3,882.27 = 856.34 : x
2. Step 2: Convert to fraction form
   2,587.58/3,882.27 = 856.34/x
3. Step 3: Cross multiply
   2,587.58x = 3,882.27 × 856.34
4. Step 4: Simplify right side
   2,587.58x = 3,324,543.09
5. Step 5: Solve for x
   x = 3,324,543.09/2,587.58
6. Step 6: Final answer
   x = 1,284.81