Finding the Fourth Proportional to 1,391.69, 1,920.62 and 802.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.69 : 1,920.62 = 802.26 : x
2. Step 2: Convert to fraction form
   1,391.69/1,920.62 = 802.26/x
3. Step 3: Cross multiply
   1,391.69x = 1,920.62 × 802.26
4. Step 4: Simplify right side
   1,391.69x = 1,540,832.59
5. Step 5: Solve for x
   x = 1,540,832.59/1,391.69
6. Step 6: Final answer
   x = 1,107.17