Finding the Fourth Proportional to 2,540.42, 3,811.35 and 809.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,540.42 : 3,811.35 = 809.18 : x
2. Step 2: Convert to fraction form
   2,540.42/3,811.35 = 809.18/x
3. Step 3: Cross multiply
   2,540.42x = 3,811.35 × 809.18
4. Step 4: Simplify right side
   2,540.42x = 3,084,068.19
5. Step 5: Solve for x
   x = 3,084,068.19/2,540.42
6. Step 6: Final answer
   x = 1,214.00