Finding the Fourth Proportional to 2,286.34, 3,155.12 and 1,238.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,286.34 : 3,155.12 = 1,238.40 : x
2. Step 2: Convert to fraction form
   2,286.34/3,155.12 = 1,238.40/x
3. Step 3: Cross multiply
   2,286.34x = 3,155.12 × 1,238.40
4. Step 4: Simplify right side
   2,286.34x = 3,907,300.61
5. Step 5: Solve for x
   x = 3,907,300.61/2,286.34
6. Step 6: Final answer
   x = 1,708.98