Finding the Fourth Proportional to 2,648.88, 3,970.73 and 1,261.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.88 : 3,970.73 = 1,261.85 : x
2. Step 2: Convert to fraction form
   2,648.88/3,970.73 = 1,261.85/x
3. Step 3: Cross multiply
   2,648.88x = 3,970.73 × 1,261.85
4. Step 4: Simplify right side
   2,648.88x = 5,010,439.49
5. Step 5: Solve for x
   x = 5,010,439.49/2,648.88
6. Step 6: Final answer
   x = 1,891.53