Finding the Fourth Proportional to 1,392.54, 1,921.60 and 802.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.54 : 1,921.60 = 802.96 : x
2. Step 2: Convert to fraction form
   1,392.54/1,921.60 = 802.96/x
3. Step 3: Cross multiply
   1,392.54x = 1,921.60 × 802.96
4. Step 4: Simplify right side
   1,392.54x = 1,542,972.69
5. Step 5: Solve for x
   x = 1,542,972.69/1,392.54
6. Step 6: Final answer
   x = 1,108.03