Finding the Fourth Proportional to 2,155.17, 3,233.96 and 856.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.17 : 3,233.96 = 856.74 : x
2. Step 2: Convert to fraction form
   2,155.17/3,233.96 = 856.74/x
3. Step 3: Cross multiply
   2,155.17x = 3,233.96 × 856.74
4. Step 4: Simplify right side
   2,155.17x = 2,770,662.89
5. Step 5: Solve for x
   x = 2,770,662.89/2,155.17
6. Step 6: Final answer
   x = 1,285.59