Finding the Fourth Proportional to 2,155.49, 3,233.83 and 857.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.49 : 3,233.83 = 857.87 : x
2. Step 2: Convert to fraction form
   2,155.49/3,233.83 = 857.87/x
3. Step 3: Cross multiply
   2,155.49x = 3,233.83 × 857.87
4. Step 4: Simplify right side
   2,155.49x = 2,774,201.16
5. Step 5: Solve for x
   x = 2,774,201.16/2,155.49
6. Step 6: Final answer
   x = 1,287.04