Finding the Fourth Proportional to 2,588.56, 3,881.94 and 856.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,588.56 : 3,881.94 = 856.72 : x
2. Step 2: Convert to fraction form
   2,588.56/3,881.94 = 856.72/x
3. Step 3: Cross multiply
   2,588.56x = 3,881.94 × 856.72
4. Step 4: Simplify right side
   2,588.56x = 3,325,735.64
5. Step 5: Solve for x
   x = 3,325,735.64/2,588.56
6. Step 6: Final answer
   x = 1,284.78