Finding the Fourth Proportional to 1,443.21, 1,991.96 and 1,165.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.21 : 1,991.96 = 1,165.29 : x
2. Step 2: Convert to fraction form
   1,443.21/1,991.96 = 1,165.29/x
3. Step 3: Cross multiply
   1,443.21x = 1,991.96 × 1,165.29
4. Step 4: Simplify right side
   1,443.21x = 2,321,205.24
5. Step 5: Solve for x
   x = 2,321,205.24/1,443.21
6. Step 6: Final answer
   x = 1,608.36