Finding the Fourth Proportional to 2,663.82, 3,994.92 and 814.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.82 : 3,994.92 = 814.59 : x
2. Step 2: Convert to fraction form
   2,663.82/3,994.92 = 814.59/x
3. Step 3: Cross multiply
   2,663.82x = 3,994.92 × 814.59
4. Step 4: Simplify right side
   2,663.82x = 3,254,221.88
5. Step 5: Solve for x
   x = 3,254,221.88/2,663.82
6. Step 6: Final answer
   x = 1,221.64