Finding the Fourth Proportional to 1,340.81, 1,850.31 and 809.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,340.81 : 1,850.31 = 809.72 : x
2. Step 2: Convert to fraction form
   1,340.81/1,850.31 = 809.72/x
3. Step 3: Cross multiply
   1,340.81x = 1,850.31 × 809.72
4. Step 4: Simplify right side
   1,340.81x = 1,498,223.76
5. Step 5: Solve for x
   x = 1,498,223.76/1,340.81
6. Step 6: Final answer
   x = 1,117.41