Finding the Fourth Proportional to 2,938.69, 4,408.03 and 990.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,938.69 : 4,408.03 = 990.89 : x
2. Step 2: Convert to fraction form
   2,938.69/4,408.03 = 990.89/x
3. Step 3: Cross multiply
   2,938.69x = 4,408.03 × 990.89
4. Step 4: Simplify right side
   2,938.69x = 4,367,872.85
5. Step 5: Solve for x
   x = 4,367,872.85/2,938.69
6. Step 6: Final answer
   x = 1,486.33