Finding the Fourth Proportional to 2,039.40, 3,057.72 and 806.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,039.40 : 3,057.72 = 806.48 : x
2. Step 2: Convert to fraction form
   2,039.40/3,057.72 = 806.48/x
3. Step 3: Cross multiply
   2,039.40x = 3,057.72 × 806.48
4. Step 4: Simplify right side
   2,039.40x = 2,465,990.03
5. Step 5: Solve for x
   x = 2,465,990.03/2,039.40
6. Step 6: Final answer
   x = 1,209.17