Finding the Fourth Proportional to 2,039.80, 3,057.63 and 806.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,039.80 : 3,057.63 = 806.55 : x
2. Step 2: Convert to fraction form
   2,039.80/3,057.63 = 806.55/x
3. Step 3: Cross multiply
   2,039.80x = 3,057.63 × 806.55
4. Step 4: Simplify right side
   2,039.80x = 2,466,131.48
5. Step 5: Solve for x
   x = 2,466,131.48/2,039.80
6. Step 6: Final answer
   x = 1,209.01