Finding the Fourth Proportional to 2,664.42, 3,996.46 and 815.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,664.42 : 3,996.46 = 815.39 : x
2. Step 2: Convert to fraction form
   2,664.42/3,996.46 = 815.39/x
3. Step 3: Cross multiply
   2,664.42x = 3,996.46 × 815.39
4. Step 4: Simplify right side
   2,664.42x = 3,258,649.46
5. Step 5: Solve for x
   x = 3,258,649.46/2,664.42
6. Step 6: Final answer
   x = 1,223.03