Finding the Fourth Proportional to 2,638.41, 3,640.95 and 1,443.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.41 : 3,640.95 = 1,443.39 : x
2. Step 2: Convert to fraction form
   2,638.41/3,640.95 = 1,443.39/x
3. Step 3: Cross multiply
   2,638.41x = 3,640.95 × 1,443.39
4. Step 4: Simplify right side
   2,638.41x = 5,255,310.82
5. Step 5: Solve for x
   x = 5,255,310.82/2,638.41
6. Step 6: Final answer
   x = 1,991.85