Finding the Fourth Proportional to 2,155.82, 3,233.19 and 839.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.82 : 3,233.19 = 839.12 : x
2. Step 2: Convert to fraction form
   2,155.82/3,233.19 = 839.12/x
3. Step 3: Cross multiply
   2,155.82x = 3,233.19 × 839.12
4. Step 4: Simplify right side
   2,155.82x = 2,713,034.39
5. Step 5: Solve for x
   x = 2,713,034.39/2,155.82
6. Step 6: Final answer
   x = 1,258.47