Finding the Fourth Proportional to 2,665.44, 3,997.68 and 816.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.44 : 3,997.68 = 816.06 : x
2. Step 2: Convert to fraction form
   2,665.44/3,997.68 = 816.06/x
3. Step 3: Cross multiply
   2,665.44x = 3,997.68 × 816.06
4. Step 4: Simplify right side
   2,665.44x = 3,262,346.74
5. Step 5: Solve for x
   x = 3,262,346.74/2,665.44
6. Step 6: Final answer
   x = 1,223.94