Finding the Fourth Proportional to 2,286.49, 3,155.35 and 1,238.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,286.49 : 3,155.35 = 1,238.55 : x
2. Step 2: Convert to fraction form
   2,286.49/3,155.35 = 1,238.55/x
3. Step 3: Cross multiply
   2,286.49x = 3,155.35 × 1,238.55
4. Step 4: Simplify right side
   2,286.49x = 3,908,058.74
5. Step 5: Solve for x
   x = 3,908,058.74/2,286.49
6. Step 6: Final answer
   x = 1,709.20