Finding the Fourth Proportional to 2,286.57, 3,155.46 and 1,238.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,286.57 : 3,155.46 = 1,238.63 : x
2. Step 2: Convert to fraction form
   2,286.57/3,155.46 = 1,238.63/x
3. Step 3: Cross multiply
   2,286.57x = 3,155.46 × 1,238.63
4. Step 4: Simplify right side
   2,286.57x = 3,908,447.42
5. Step 5: Solve for x
   x = 3,908,447.42/2,286.57
6. Step 6: Final answer
   x = 1,709.31