Finding the Fourth Proportional to 1,391.81, 1,920.18 and 802.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.81 : 1,920.18 = 802.04 : x
2. Step 2: Convert to fraction form
   1,391.81/1,920.18 = 802.04/x
3. Step 3: Cross multiply
   1,391.81x = 1,920.18 × 802.04
4. Step 4: Simplify right side
   1,391.81x = 1,540,061.17
5. Step 5: Solve for x
   x = 1,540,061.17/1,391.81
6. Step 6: Final answer
   x = 1,106.52