Finding the Fourth Proportional to 2,543.46, 3,815.15 and 812.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,543.46 : 3,815.15 = 812.09 : x
2. Step 2: Convert to fraction form
   2,543.46/3,815.15 = 812.09/x
3. Step 3: Cross multiply
   2,543.46x = 3,815.15 × 812.09
4. Step 4: Simplify right side
   2,543.46x = 3,098,222.03
5. Step 5: Solve for x
   x = 3,098,222.03/2,543.46
6. Step 6: Final answer
   x = 1,218.11