Finding the Fourth Proportional to 2,057.10, 3,086.94 and 808.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.10 : 3,086.94 = 808.76 : x
2. Step 2: Convert to fraction form
   2,057.10/3,086.94 = 808.76/x
3. Step 3: Cross multiply
   2,057.10x = 3,086.94 × 808.76
4. Step 4: Simplify right side
   2,057.10x = 2,496,593.59
5. Step 5: Solve for x
   x = 2,496,593.59/2,057.10
6. Step 6: Final answer
   x = 1,213.65