Finding the Fourth Proportional to 2,270.72, 3,405.98 and 809.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,270.72 : 3,405.98 = 809.04 : x
2. Step 2: Convert to fraction form
   2,270.72/3,405.98 = 809.04/x
3. Step 3: Cross multiply
   2,270.72x = 3,405.98 × 809.04
4. Step 4: Simplify right side
   2,270.72x = 2,755,574.06
5. Step 5: Solve for x
   x = 2,755,574.06/2,270.72
6. Step 6: Final answer
   x = 1,213.52