Finding the Fourth Proportional to 1,391.61, 1,920.48 and 802.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.61 : 1,920.48 = 802.14 : x
2. Step 2: Convert to fraction form
   1,391.61/1,920.48 = 802.14/x
3. Step 3: Cross multiply
   1,391.61x = 1,920.48 × 802.14
4. Step 4: Simplify right side
   1,391.61x = 1,540,493.83
5. Step 5: Solve for x
   x = 1,540,493.83/1,391.61
6. Step 6: Final answer
   x = 1,106.99