Finding the Fourth Proportional to 2,105.73, 3,157.56 and 1,228.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.73 : 3,157.56 = 1,228.55 : x
2. Step 2: Convert to fraction form
   2,105.73/3,157.56 = 1,228.55/x
3. Step 3: Cross multiply
   2,105.73x = 3,157.56 × 1,228.55
4. Step 4: Simplify right side
   2,105.73x = 3,879,204.55
5. Step 5: Solve for x
   x = 3,879,204.55/2,105.73
6. Step 6: Final answer
   x = 1,842.21