Finding the Fourth Proportional to 2,663.31, 3,995.58 and 814.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.31 : 3,995.58 = 814.42 : x
2. Step 2: Convert to fraction form
   2,663.31/3,995.58 = 814.42/x
3. Step 3: Cross multiply
   2,663.31x = 3,995.58 × 814.42
4. Step 4: Simplify right side
   2,663.31x = 3,254,080.26
5. Step 5: Solve for x
   x = 3,254,080.26/2,663.31
6. Step 6: Final answer
   x = 1,221.82