Finding the Fourth Proportional to 1,391.90, 1,920.02 and 802.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.90 : 1,920.02 = 802.32 : x
2. Step 2: Convert to fraction form
   1,391.90/1,920.02 = 802.32/x
3. Step 3: Cross multiply
   1,391.90x = 1,920.02 × 802.32
4. Step 4: Simplify right side
   1,391.90x = 1,540,466.43
5. Step 5: Solve for x
   x = 1,540,466.43/1,391.90
6. Step 6: Final answer
   x = 1,106.74