Finding the Fourth Proportional to 1,391.46, 1,920.33 and 802.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.46 : 1,920.33 = 802.11 : x
2. Step 2: Convert to fraction form
   1,391.46/1,920.33 = 802.11/x
3. Step 3: Cross multiply
   1,391.46x = 1,920.33 × 802.11
4. Step 4: Simplify right side
   1,391.46x = 1,540,315.90
5. Step 5: Solve for x
   x = 1,540,315.90/1,391.46
6. Step 6: Final answer
   x = 1,106.98