Finding the Fourth Proportional to 2,648.16, 3,968.73 and 1,331.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.16 : 3,968.73 = 1,331.91 : x
2. Step 2: Convert to fraction form
   2,648.16/3,968.73 = 1,331.91/x
3. Step 3: Cross multiply
   2,648.16x = 3,968.73 × 1,331.91
4. Step 4: Simplify right side
   2,648.16x = 5,285,991.17
5. Step 5: Solve for x
   x = 5,285,991.17/2,648.16
6. Step 6: Final answer
   x = 1,996.10