Finding the Fourth Proportional to 2,105.97, 3,157.16 and 808.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.97 : 3,157.16 = 808.37 : x
2. Step 2: Convert to fraction form
   2,105.97/3,157.16 = 808.37/x
3. Step 3: Cross multiply
   2,105.97x = 3,157.16 × 808.37
4. Step 4: Simplify right side
   2,105.97x = 2,552,149.39
5. Step 5: Solve for x
   x = 2,552,149.39/2,105.97
6. Step 6: Final answer
   x = 1,211.86