Finding the Fourth Proportional to 2,638.17, 3,640.66 and 1,443.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.17 : 3,640.66 = 1,443.17 : x
2. Step 2: Convert to fraction form
   2,638.17/3,640.66 = 1,443.17/x
3. Step 3: Cross multiply
   2,638.17x = 3,640.66 × 1,443.17
4. Step 4: Simplify right side
   2,638.17x = 5,254,084.43
5. Step 5: Solve for x
   x = 5,254,084.43/2,638.17
6. Step 6: Final answer
   x = 1,991.56