Finding the Fourth Proportional to 1,443.12, 1,989.39 and 1,022.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.12 : 1,989.39 = 1,022.17 : x
2. Step 2: Convert to fraction form
   1,443.12/1,989.39 = 1,022.17/x
3. Step 3: Cross multiply
   1,443.12x = 1,989.39 × 1,022.17
4. Step 4: Simplify right side
   1,443.12x = 2,033,494.78
5. Step 5: Solve for x
   x = 2,033,494.78/1,443.12
6. Step 6: Final answer
   x = 1,409.10