Finding the Fourth Proportional to 1,391.38, 1,920.55 and 802.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.38 : 1,920.55 = 802.32 : x
2. Step 2: Convert to fraction form
   1,391.38/1,920.55 = 802.32/x
3. Step 3: Cross multiply
   1,391.38x = 1,920.55 × 802.32
4. Step 4: Simplify right side
   1,391.38x = 1,540,895.68
5. Step 5: Solve for x
   x = 1,540,895.68/1,391.38
6. Step 6: Final answer
   x = 1,107.46