Finding the Fourth Proportional to 2,648.94, 3,970.86 and 1,261.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.94 : 3,970.86 = 1,261.54 : x
2. Step 2: Convert to fraction form
   2,648.94/3,970.86 = 1,261.54/x
3. Step 3: Cross multiply
   2,648.94x = 3,970.86 × 1,261.54
4. Step 4: Simplify right side
   2,648.94x = 5,009,398.96
5. Step 5: Solve for x
   x = 5,009,398.96/2,648.94
6. Step 6: Final answer
   x = 1,891.10