Finding the Fourth Proportional to 1,333.20, 1,839.42 and 809.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,333.20 : 1,839.42 = 809.40 : x
2. Step 2: Convert to fraction form
   1,333.20/1,839.42 = 809.40/x
3. Step 3: Cross multiply
   1,333.20x = 1,839.42 × 809.40
4. Step 4: Simplify right side
   1,333.20x = 1,488,826.55
5. Step 5: Solve for x
   x = 1,488,826.55/1,333.20
6. Step 6: Final answer
   x = 1,116.73