Finding the Fourth Proportional to 2,155.57, 3,233.17 and 856.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.57 : 3,233.17 = 856.69 : x
2. Step 2: Convert to fraction form
   2,155.57/3,233.17 = 856.69/x
3. Step 3: Cross multiply
   2,155.57x = 3,233.17 × 856.69
4. Step 4: Simplify right side
   2,155.57x = 2,769,803.96
5. Step 5: Solve for x
   x = 2,769,803.96/2,155.57
6. Step 6: Final answer
   x = 1,284.95