Finding the Fourth Proportional to 2,587.69, 3,881.22 and 856.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,587.69 : 3,881.22 = 856.27 : x
2. Step 2: Convert to fraction form
   2,587.69/3,881.22 = 856.27/x
3. Step 3: Cross multiply
   2,587.69x = 3,881.22 × 856.27
4. Step 4: Simplify right side
   2,587.69x = 3,323,372.25
5. Step 5: Solve for x
   x = 3,323,372.25/2,587.69
6. Step 6: Final answer
   x = 1,284.30