Finding the Fourth Proportional to 1,069.58, 1,608.03 and 989.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,069.58 : 1,608.03 = 989.42 : x
2. Step 2: Convert to fraction form
   1,069.58/1,608.03 = 989.42/x
3. Step 3: Cross multiply
   1,069.58x = 1,608.03 × 989.42
4. Step 4: Simplify right side
   1,069.58x = 1,591,017.04
5. Step 5: Solve for x
   x = 1,591,017.04/1,069.58
6. Step 6: Final answer
   x = 1,487.52