Finding the Fourth Proportional to 2,664.17, 3,996.84 and 815.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,664.17 : 3,996.84 = 815.42 : x
2. Step 2: Convert to fraction form
   2,664.17/3,996.84 = 815.42/x
3. Step 3: Cross multiply
   2,664.17x = 3,996.84 × 815.42
4. Step 4: Simplify right side
   2,664.17x = 3,259,103.27
5. Step 5: Solve for x
   x = 3,259,103.27/2,664.17
6. Step 6: Final answer
   x = 1,223.31