Finding the Fourth Proportional to 1,391.54, 1,920.30 and 802.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.54 : 1,920.30 = 802.02 : x
2. Step 2: Convert to fraction form
   1,391.54/1,920.30 = 802.02/x
3. Step 3: Cross multiply
   1,391.54x = 1,920.30 × 802.02
4. Step 4: Simplify right side
   1,391.54x = 1,540,119.01
5. Step 5: Solve for x
   x = 1,540,119.01/1,391.54
6. Step 6: Final answer
   x = 1,106.77