Finding the Fourth Proportional to 2,456.11, 3,684.69 and 812.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,456.11 : 3,684.69 = 812.57 : x
2. Step 2: Convert to fraction form
   2,456.11/3,684.69 = 812.57/x
3. Step 3: Cross multiply
   2,456.11x = 3,684.69 × 812.57
4. Step 4: Simplify right side
   2,456.11x = 2,994,068.55
5. Step 5: Solve for x
   x = 2,994,068.55/2,456.11
6. Step 6: Final answer
   x = 1,219.03