Finding the Fourth Proportional to 2,286.67, 3,155.60 and 1,238.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,286.67 : 3,155.60 = 1,238.74 : x
2. Step 2: Convert to fraction form
   2,286.67/3,155.60 = 1,238.74/x
3. Step 3: Cross multiply
   2,286.67x = 3,155.60 × 1,238.74
4. Step 4: Simplify right side
   2,286.67x = 3,908,952.17
5. Step 5: Solve for x
   x = 3,908,952.17/2,286.67
6. Step 6: Final answer
   x = 1,709.45