Finding the Fourth Proportional to 2,664.90, 3,997.56 and 816.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,664.90 : 3,997.56 = 816.18 : x
2. Step 2: Convert to fraction form
   2,664.90/3,997.56 = 816.18/x
3. Step 3: Cross multiply
   2,664.90x = 3,997.56 × 816.18
4. Step 4: Simplify right side
   2,664.90x = 3,262,728.52
5. Step 5: Solve for x
   x = 3,262,728.52/2,664.90
6. Step 6: Final answer
   x = 1,224.33