Finding the Fourth Proportional to 2,286.88, 3,155.91 and 1,238.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,286.88 : 3,155.91 = 1,238.96 : x
2. Step 2: Convert to fraction form
   2,286.88/3,155.91 = 1,238.96/x
3. Step 3: Cross multiply
   2,286.88x = 3,155.91 × 1,238.96
4. Step 4: Simplify right side
   2,286.88x = 3,910,046.25
5. Step 5: Solve for x
   x = 3,910,046.25/2,286.88
6. Step 6: Final answer
   x = 1,709.78