Finding the Fourth Proportional to 1,391.84, 1,920.52 and 802.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.84 : 1,920.52 = 802.26 : x
2. Step 2: Convert to fraction form
   1,391.84/1,920.52 = 802.26/x
3. Step 3: Cross multiply
   1,391.84x = 1,920.52 × 802.26
4. Step 4: Simplify right side
   1,391.84x = 1,540,756.38
5. Step 5: Solve for x
   x = 1,540,756.38/1,391.84
6. Step 6: Final answer
   x = 1,106.99