Finding the Fourth Proportional to 1,391.45, 1,920.18 and 802.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.45 : 1,920.18 = 802.01 : x
2. Step 2: Convert to fraction form
   1,391.45/1,920.18 = 802.01/x
3. Step 3: Cross multiply
   1,391.45x = 1,920.18 × 802.01
4. Step 4: Simplify right side
   1,391.45x = 1,540,003.56
5. Step 5: Solve for x
   x = 1,540,003.56/1,391.45
6. Step 6: Final answer
   x = 1,106.76