Finding the Fourth Proportional to 2,588.28, 3,881.58 and 856.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,588.28 : 3,881.58 = 856.50 : x
2. Step 2: Convert to fraction form
   2,588.28/3,881.58 = 856.50/x
3. Step 3: Cross multiply
   2,588.28x = 3,881.58 × 856.50
4. Step 4: Simplify right side
   2,588.28x = 3,324,573.27
5. Step 5: Solve for x
   x = 3,324,573.27/2,588.28
6. Step 6: Final answer
   x = 1,284.47