Finding the Fourth Proportional to 2,938.35, 4,404.45 and 989.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,938.35 : 4,404.45 = 989.88 : x
2. Step 2: Convert to fraction form
   2,938.35/4,404.45 = 989.88/x
3. Step 3: Cross multiply
   2,938.35x = 4,404.45 × 989.88
4. Step 4: Simplify right side
   2,938.35x = 4,359,876.97
5. Step 5: Solve for x
   x = 4,359,876.97/2,938.35
6. Step 6: Final answer
   x = 1,483.78