Finding the Fourth Proportional to 2,648.49, 3,970.14 and 1,261.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.49 : 3,970.14 = 1,261.45 : x
2. Step 2: Convert to fraction form
   2,648.49/3,970.14 = 1,261.45/x
3. Step 3: Cross multiply
   2,648.49x = 3,970.14 × 1,261.45
4. Step 4: Simplify right side
   2,648.49x = 5,008,113.25
5. Step 5: Solve for x
   x = 5,008,113.25/2,648.49
6. Step 6: Final answer
   x = 1,890.94