Finding the Fourth Proportional to 2,938.90, 4,407.55 and 990.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,938.90 : 4,407.55 = 990.82 : x
2. Step 2: Convert to fraction form
   2,938.90/4,407.55 = 990.82/x
3. Step 3: Cross multiply
   2,938.90x = 4,407.55 × 990.82
4. Step 4: Simplify right side
   2,938.90x = 4,367,088.69
5. Step 5: Solve for x
   x = 4,367,088.69/2,938.90
6. Step 6: Final answer
   x = 1,485.96