Finding the Fourth Proportional to 2,648.12, 3,966.88 and 1,262.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.12 : 3,966.88 = 1,262.80 : x
2. Step 2: Convert to fraction form
   2,648.12/3,966.88 = 1,262.80/x
3. Step 3: Cross multiply
   2,648.12x = 3,966.88 × 1,262.80
4. Step 4: Simplify right side
   2,648.12x = 5,009,376.06
5. Step 5: Solve for x
   x = 5,009,376.06/2,648.12
6. Step 6: Final answer
   x = 1,891.67