Finding the Fourth Proportional to 1,604.59, 2,408.38 and 989.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,604.59 : 2,408.38 = 989.48 : x
2. Step 2: Convert to fraction form
   1,604.59/2,408.38 = 989.48/x
3. Step 3: Cross multiply
   1,604.59x = 2,408.38 × 989.48
4. Step 4: Simplify right side
   1,604.59x = 2,383,047.39
5. Step 5: Solve for x
   x = 2,383,047.39/1,604.59
6. Step 6: Final answer
   x = 1,485.15