Finding the Fourth Proportional to 2,105.56, 3,154.24 and 1,281.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.56 : 3,154.24 = 1,281.79 : x
2. Step 2: Convert to fraction form
   2,105.56/3,154.24 = 1,281.79/x
3. Step 3: Cross multiply
   2,105.56x = 3,154.24 × 1,281.79
4. Step 4: Simplify right side
   2,105.56x = 4,043,066.88
5. Step 5: Solve for x
   x = 4,043,066.88/2,105.56
6. Step 6: Final answer
   x = 1,920.19