Finding the Fourth Proportional to 2,938.72, 4,408.06 and 990.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,938.72 : 4,408.06 = 990.46 : x
2. Step 2: Convert to fraction form
   2,938.72/4,408.06 = 990.46/x
3. Step 3: Cross multiply
   2,938.72x = 4,408.06 × 990.46
4. Step 4: Simplify right side
   2,938.72x = 4,366,007.11
5. Step 5: Solve for x
   x = 4,366,007.11/2,938.72
6. Step 6: Final answer
   x = 1,485.68