Finding the Fourth Proportional to 2,491.80, 3,437.28 and 1,443.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,491.80 : 3,437.28 = 1,443.72 : x
2. Step 2: Convert to fraction form
   2,491.80/3,437.28 = 1,443.72/x
3. Step 3: Cross multiply
   2,491.80x = 3,437.28 × 1,443.72
4. Step 4: Simplify right side
   2,491.80x = 4,962,469.88
5. Step 5: Solve for x
   x = 4,962,469.88/2,491.80
6. Step 6: Final answer
   x = 1,991.52