Finding the Fourth Proportional to 1,635.33, 2,455.47 and 816.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,635.33 : 2,455.47 = 816.42 : x
2. Step 2: Convert to fraction form
   1,635.33/2,455.47 = 816.42/x
3. Step 3: Cross multiply
   1,635.33x = 2,455.47 × 816.42
4. Step 4: Simplify right side
   1,635.33x = 2,004,694.82
5. Step 5: Solve for x
   x = 2,004,694.82/1,635.33
6. Step 6: Final answer
   x = 1,225.87