Finding the Fourth Proportional to 1,398.69, 1,930.07 and 809.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.69 : 1,930.07 = 809.27 : x
2. Step 2: Convert to fraction form
   1,398.69/1,930.07 = 809.27/x
3. Step 3: Cross multiply
   1,398.69x = 1,930.07 × 809.27
4. Step 4: Simplify right side
   1,398.69x = 1,561,934.05
5. Step 5: Solve for x
   x = 1,561,934.05/1,398.69
6. Step 6: Final answer
   x = 1,116.71