Finding the Fourth Proportional to 2,189.25, 3,020.31 and 1,443.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.25 : 3,020.31 = 1,443.60 : x
2. Step 2: Convert to fraction form
   2,189.25/3,020.31 = 1,443.60/x
3. Step 3: Cross multiply
   2,189.25x = 3,020.31 × 1,443.60
4. Step 4: Simplify right side
   2,189.25x = 4,360,119.52
5. Step 5: Solve for x
   x = 4,360,119.52/2,189.25
6. Step 6: Final answer
   x = 1,991.60