Finding the Fourth Proportional to 2,662.81, 3,994.80 and 814.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,662.81 : 3,994.80 = 814.06 : x
2. Step 2: Convert to fraction form
   2,662.81/3,994.80 = 814.06/x
3. Step 3: Cross multiply
   2,662.81x = 3,994.80 × 814.06
4. Step 4: Simplify right side
   2,662.81x = 3,252,006.89
5. Step 5: Solve for x
   x = 3,252,006.89/2,662.81
6. Step 6: Final answer
   x = 1,221.27