Finding the Fourth Proportional to 2,286.62, 3,155.56 and 1,238.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,286.62 : 3,155.56 = 1,238.72 : x
2. Step 2: Convert to fraction form
   2,286.62/3,155.56 = 1,238.72/x
3. Step 3: Cross multiply
   2,286.62x = 3,155.56 × 1,238.72
4. Step 4: Simplify right side
   2,286.62x = 3,908,855.28
5. Step 5: Solve for x
   x = 3,908,855.28/2,286.62
6. Step 6: Final answer
   x = 1,709.45