Finding the Fourth Proportional to 2,155.91, 3,233.88 and 857.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.91 : 3,233.88 = 857.38 : x
2. Step 2: Convert to fraction form
   2,155.91/3,233.88 = 857.38/x
3. Step 3: Cross multiply
   2,155.91x = 3,233.88 × 857.38
4. Step 4: Simplify right side
   2,155.91x = 2,772,664.03
5. Step 5: Solve for x
   x = 2,772,664.03/2,155.91
6. Step 6: Final answer
   x = 1,286.08