Finding the Fourth Proportional to 1,391.92, 1,919.52 and 949.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.92 : 1,919.52 = 949.12 : x
2. Step 2: Convert to fraction form
   1,391.92/1,919.52 = 949.12/x
3. Step 3: Cross multiply
   1,391.92x = 1,919.52 × 949.12
4. Step 4: Simplify right side
   1,391.92x = 1,821,854.82
5. Step 5: Solve for x
   x = 1,821,854.82/1,391.92
6. Step 6: Final answer
   x = 1,308.88