Finding the Fourth Proportional to 2,587.72, 3,882.22 and 856.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,587.72 : 3,882.22 = 856.52 : x
2. Step 2: Convert to fraction form
   2,587.72/3,882.22 = 856.52/x
3. Step 3: Cross multiply
   2,587.72x = 3,882.22 × 856.52
4. Step 4: Simplify right side
   2,587.72x = 3,325,199.07
5. Step 5: Solve for x
   x = 3,325,199.07/2,587.72
6. Step 6: Final answer
   x = 1,284.99