Finding the Fourth Proportional to 1,392.02, 1,921.02 and 802.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.02 : 1,921.02 = 802.61 : x
2. Step 2: Convert to fraction form
   1,392.02/1,921.02 = 802.61/x
3. Step 3: Cross multiply
   1,392.02x = 1,921.02 × 802.61
4. Step 4: Simplify right side
   1,392.02x = 1,541,829.86
5. Step 5: Solve for x
   x = 1,541,829.86/1,392.02
6. Step 6: Final answer
   x = 1,107.62