Finding the Fourth Proportional to 1,391.42, 1,920.02 and 802.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.42 : 1,920.02 = 802.20 : x
2. Step 2: Convert to fraction form
   1,391.42/1,920.02 = 802.20/x
3. Step 3: Cross multiply
   1,391.42x = 1,920.02 × 802.20
4. Step 4: Simplify right side
   1,391.42x = 1,540,240.04
5. Step 5: Solve for x
   x = 1,540,240.04/1,391.42
6. Step 6: Final answer
   x = 1,106.96