Finding the Fourth Proportional to 2,057.72, 3,085.98 and 808.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.72 : 3,085.98 = 808.10 : x
2. Step 2: Convert to fraction form
   2,057.72/3,085.98 = 808.10/x
3. Step 3: Cross multiply
   2,057.72x = 3,085.98 × 808.10
4. Step 4: Simplify right side
   2,057.72x = 2,493,780.44
5. Step 5: Solve for x
   x = 2,493,780.44/2,057.72
6. Step 6: Final answer
   x = 1,211.91