Finding the Fourth Proportional to 1,391.94, 1,921.14 and 802.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.94 : 1,921.14 = 802.62 : x
2. Step 2: Convert to fraction form
   1,391.94/1,921.14 = 802.62/x
3. Step 3: Cross multiply
   1,391.94x = 1,921.14 × 802.62
4. Step 4: Simplify right side
   1,391.94x = 1,541,945.39
5. Step 5: Solve for x
   x = 1,541,945.39/1,391.94
6. Step 6: Final answer
   x = 1,107.77