Finding the Fourth Proportional to 1,391.24, 1,920.33 and 802.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.24 : 1,920.33 = 802.16 : x
2. Step 2: Convert to fraction form
   1,391.24/1,920.33 = 802.16/x
3. Step 3: Cross multiply
   1,391.24x = 1,920.33 × 802.16
4. Step 4: Simplify right side
   1,391.24x = 1,540,411.91
5. Step 5: Solve for x
   x = 1,540,411.91/1,391.24
6. Step 6: Final answer
   x = 1,107.22