Finding the Fourth Proportional to 2,660.23, 3,990.17 and 994.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,660.23 : 3,990.17 = 994.03 : x
2. Step 2: Convert to fraction form
   2,660.23/3,990.17 = 994.03/x
3. Step 3: Cross multiply
   2,660.23x = 3,990.17 × 994.03
4. Step 4: Simplify right side
   2,660.23x = 3,966,348.69
5. Step 5: Solve for x
   x = 3,966,348.69/2,660.23
6. Step 6: Final answer
   x = 1,490.98