Finding the Fourth Proportional to 2,662.80, 3,994.55 and 814.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,662.80 : 3,994.55 = 814.04 : x
2. Step 2: Convert to fraction form
   2,662.80/3,994.55 = 814.04/x
3. Step 3: Cross multiply
   2,662.80x = 3,994.55 × 814.04
4. Step 4: Simplify right side
   2,662.80x = 3,251,723.48
5. Step 5: Solve for x
   x = 3,251,723.48/2,662.80
6. Step 6: Final answer
   x = 1,221.17