Finding the Fourth Proportional to 1,636.40, 2,452.72 and 812.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.40 : 2,452.72 = 812.83 : x
2. Step 2: Convert to fraction form
   1,636.40/2,452.72 = 812.83/x
3. Step 3: Cross multiply
   1,636.40x = 2,452.72 × 812.83
4. Step 4: Simplify right side
   1,636.40x = 1,993,644.40
5. Step 5: Solve for x
   x = 1,993,644.40/1,636.40
6. Step 6: Final answer
   x = 1,218.31