Finding the Fourth Proportional to 2,663.31, 3,995.55 and 814.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.31 : 3,995.55 = 814.56 : x
2. Step 2: Convert to fraction form
   2,663.31/3,995.55 = 814.56/x
3. Step 3: Cross multiply
   2,663.31x = 3,995.55 × 814.56
4. Step 4: Simplify right side
   2,663.31x = 3,254,615.21
5. Step 5: Solve for x
   x = 3,254,615.21/2,663.31
6. Step 6: Final answer
   x = 1,222.02