Finding the Fourth Proportional to 2,105.01, 3,155.68 and 805.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.01 : 3,155.68 = 805.57 : x
2. Step 2: Convert to fraction form
   2,105.01/3,155.68 = 805.57/x
3. Step 3: Cross multiply
   2,105.01x = 3,155.68 × 805.57
4. Step 4: Simplify right side
   2,105.01x = 2,542,125.40
5. Step 5: Solve for x
   x = 2,542,125.40/2,105.01
6. Step 6: Final answer
   x = 1,207.65