Finding the Fourth Proportional to 2,544.59, 3,814.45 and 812.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,544.59 : 3,814.45 = 812.09 : x
2. Step 2: Convert to fraction form
   2,544.59/3,814.45 = 812.09/x
3. Step 3: Cross multiply
   2,544.59x = 3,814.45 × 812.09
4. Step 4: Simplify right side
   2,544.59x = 3,097,676.70
5. Step 5: Solve for x
   x = 3,097,676.70/2,544.59
6. Step 6: Final answer
   x = 1,217.36