Finding the Fourth Proportional to 2,286.66, 3,155.61 and 1,238.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,286.66 : 3,155.61 = 1,238.72 : x
2. Step 2: Convert to fraction form
   2,286.66/3,155.61 = 1,238.72/x
3. Step 3: Cross multiply
   2,286.66x = 3,155.61 × 1,238.72
4. Step 4: Simplify right side
   2,286.66x = 3,908,911.03
5. Step 5: Solve for x
   x = 3,908,911.03/2,286.66
6. Step 6: Final answer
   x = 1,709.44