Finding the Fourth Proportional to 1,391.78, 1,920.92 and 949.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.78 : 1,920.92 = 949.52 : x
2. Step 2: Convert to fraction form
   1,391.78/1,920.92 = 949.52/x
3. Step 3: Cross multiply
   1,391.78x = 1,920.92 × 949.52
4. Step 4: Simplify right side
   1,391.78x = 1,823,952.01
5. Step 5: Solve for x
   x = 1,823,952.01/1,391.78
6. Step 6: Final answer
   x = 1,310.52