Finding the Fourth Proportional to 1,394.24, 1,923.20 and 1,022.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,394.24 : 1,923.20 = 1,022.72 : x
2. Step 2: Convert to fraction form
   1,394.24/1,923.20 = 1,022.72/x
3. Step 3: Cross multiply
   1,394.24x = 1,923.20 × 1,022.72
4. Step 4: Simplify right side
   1,394.24x = 1,966,895.10
5. Step 5: Solve for x
   x = 1,966,895.10/1,394.24
6. Step 6: Final answer
   x = 1,410.73