Finding the Fourth Proportional to 1,443.62, 2,165.52 and 389.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.62 : 2,165.52 = 389.59 : x
2. Step 2: Convert to fraction form
   1,443.62/2,165.52 = 389.59/x
3. Step 3: Cross multiply
   1,443.62x = 2,165.52 × 389.59
4. Step 4: Simplify right side
   1,443.62x = 843,670.97
5. Step 5: Solve for x
   x = 843,670.97/1,443.62
6. Step 6: Final answer
   x = 584.41