Finding the Fourth Proportional to 2,664.25, 3,996.32 and 815.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,664.25 : 3,996.32 = 815.38 : x
2. Step 2: Convert to fraction form
   2,664.25/3,996.32 = 815.38/x
3. Step 3: Cross multiply
   2,664.25x = 3,996.32 × 815.38
4. Step 4: Simplify right side
   2,664.25x = 3,258,530.21
5. Step 5: Solve for x
   x = 3,258,530.21/2,664.25
6. Step 6: Final answer
   x = 1,223.06