Finding the Fourth Proportional to 1,391.87, 1,921.33 and 950.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.87 : 1,921.33 = 950.02 : x
2. Step 2: Convert to fraction form
   1,391.87/1,921.33 = 950.02/x
3. Step 3: Cross multiply
   1,391.87x = 1,921.33 × 950.02
4. Step 4: Simplify right side
   1,391.87x = 1,825,287.57
5. Step 5: Solve for x
   x = 1,825,287.57/1,391.87
6. Step 6: Final answer
   x = 1,311.39