Finding the Fourth Proportional to 1,608.17, 2,408.69 and 989.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,608.17 : 2,408.69 = 989.98 : x
2. Step 2: Convert to fraction form
   1,608.17/2,408.69 = 989.98/x
3. Step 3: Cross multiply
   1,608.17x = 2,408.69 × 989.98
4. Step 4: Simplify right side
   1,608.17x = 2,384,551.38
5. Step 5: Solve for x
   x = 2,384,551.38/1,608.17
6. Step 6: Final answer
   x = 1,482.78