Finding the Fourth Proportional to 2,648.35, 3,970.41 and 1,331.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.35 : 3,970.41 = 1,331.40 : x
2. Step 2: Convert to fraction form
   2,648.35/3,970.41 = 1,331.40/x
3. Step 3: Cross multiply
   2,648.35x = 3,970.41 × 1,331.40
4. Step 4: Simplify right side
   2,648.35x = 5,286,203.87
5. Step 5: Solve for x
   x = 5,286,203.87/2,648.35
6. Step 6: Final answer
   x = 1,996.04