Finding the Fourth Proportional to 1,391.82, 1,920.87 and 802.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.82 : 1,920.87 = 802.33 : x
2. Step 2: Convert to fraction form
   1,391.82/1,920.87 = 802.33/x
3. Step 3: Cross multiply
   1,391.82x = 1,920.87 × 802.33
4. Step 4: Simplify right side
   1,391.82x = 1,541,171.63
5. Step 5: Solve for x
   x = 1,541,171.63/1,391.82
6. Step 6: Final answer
   x = 1,107.31