Finding the Fourth Proportional to 1,392.32, 1,921.76 and 802.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.32 : 1,921.76 = 802.89 : x
2. Step 2: Convert to fraction form
   1,392.32/1,921.76 = 802.89/x
3. Step 3: Cross multiply
   1,392.32x = 1,921.76 × 802.89
4. Step 4: Simplify right side
   1,392.32x = 1,542,957.87
5. Step 5: Solve for x
   x = 1,542,957.87/1,392.32
6. Step 6: Final answer
   x = 1,108.20