Finding the Fourth Proportional to 2,648, 3,969.42 and 1,260.97

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648 : 3,969.42 = 1,260.97 : x
2. Step 2: Convert to fraction form
   2,648/3,969.42 = 1,260.97/x
3. Step 3: Cross multiply
   2,648x = 3,969.42 × 1,260.97
4. Step 4: Simplify right side
   2,648x = 5,005,296.54
5. Step 5: Solve for x
   x = 5,005,296.54/2,648
6. Step 6: Final answer
   x = 1,890.22