Finding the Fourth Proportional to 2,540.14, 3,810.78 and 808.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,540.14 : 3,810.78 = 808.76 : x
2. Step 2: Convert to fraction form
   2,540.14/3,810.78 = 808.76/x
3. Step 3: Cross multiply
   2,540.14x = 3,810.78 × 808.76
4. Step 4: Simplify right side
   2,540.14x = 3,082,015.96
5. Step 5: Solve for x
   x = 3,082,015.96/2,540.14
6. Step 6: Final answer
   x = 1,213.33