Finding the Fourth Proportional to 1,391.67, 1,920.37 and 802.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.67 : 1,920.37 = 802.19 : x
2. Step 2: Convert to fraction form
   1,391.67/1,920.37 = 802.19/x
3. Step 3: Cross multiply
   1,391.67x = 1,920.37 × 802.19
4. Step 4: Simplify right side
   1,391.67x = 1,540,501.61
5. Step 5: Solve for x
   x = 1,540,501.61/1,391.67
6. Step 6: Final answer
   x = 1,106.94