Finding the Fourth Proportional to 2,665.73, 3,996.99 and 816.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.73 : 3,996.99 = 816.50 : x
2. Step 2: Convert to fraction form
   2,665.73/3,996.99 = 816.50/x
3. Step 3: Cross multiply
   2,665.73x = 3,996.99 × 816.50
4. Step 4: Simplify right side
   2,665.73x = 3,263,522.35
5. Step 5: Solve for x
   x = 3,263,522.35/2,665.73
6. Step 6: Final answer
   x = 1,224.25