Finding the Fourth Proportional to 2,105.47, 3,154.09 and 1,281.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.47 : 3,154.09 = 1,281.70 : x
2. Step 2: Convert to fraction form
   2,105.47/3,154.09 = 1,281.70/x
3. Step 3: Cross multiply
   2,105.47x = 3,154.09 × 1,281.70
4. Step 4: Simplify right side
   2,105.47x = 4,042,597.15
5. Step 5: Solve for x
   x = 4,042,597.15/2,105.47
6. Step 6: Final answer
   x = 1,920.05