Finding the Fourth Proportional to 2,665.22, 3,997.78 and 816.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.22 : 3,997.78 = 816.32 : x
2. Step 2: Convert to fraction form
   2,665.22/3,997.78 = 816.32/x
3. Step 3: Cross multiply
   2,665.22x = 3,997.78 × 816.32
4. Step 4: Simplify right side
   2,665.22x = 3,263,475.72
5. Step 5: Solve for x
   x = 3,263,475.72/2,665.22
6. Step 6: Final answer
   x = 1,224.47