Finding the Fourth Proportional to 2,663.69, 3,994.20 and 814.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.69 : 3,994.20 = 814.37 : x
2. Step 2: Convert to fraction form
   2,663.69/3,994.20 = 814.37/x
3. Step 3: Cross multiply
   2,663.69x = 3,994.20 × 814.37
4. Step 4: Simplify right side
   2,663.69x = 3,252,756.65
5. Step 5: Solve for x
   x = 3,252,756.65/2,663.69
6. Step 6: Final answer
   x = 1,221.15