Finding the Fourth Proportional to 1,636.38, 2,453.52 and 814.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.38 : 2,453.52 = 814.23 : x
2. Step 2: Convert to fraction form
   1,636.38/2,453.52 = 814.23/x
3. Step 3: Cross multiply
   1,636.38x = 2,453.52 × 814.23
4. Step 4: Simplify right side
   1,636.38x = 1,997,729.59
5. Step 5: Solve for x
   x = 1,997,729.59/1,636.38
6. Step 6: Final answer
   x = 1,220.82