Finding the Fourth Proportional to 1,636.50, 2,456.33 and 815.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.50 : 2,456.33 = 815.37 : x
2. Step 2: Convert to fraction form
   1,636.50/2,456.33 = 815.37/x
3. Step 3: Cross multiply
   1,636.50x = 2,456.33 × 815.37
4. Step 4: Simplify right side
   1,636.50x = 2,002,804.50
5. Step 5: Solve for x
   x = 2,002,804.50/1,636.50
6. Step 6: Final answer
   x = 1,223.83