Finding the Fourth Proportional to 3,456.21, 5,183.25 and 990.37

Step by Step Solution

1. Step 1: Write the proportion equation
   3,456.21 : 5,183.25 = 990.37 : x
2. Step 2: Convert to fraction form
   3,456.21/5,183.25 = 990.37/x
3. Step 3: Cross multiply
   3,456.21x = 5,183.25 × 990.37
4. Step 4: Simplify right side
   3,456.21x = 5,133,335.30
5. Step 5: Solve for x
   x = 5,133,335.30/3,456.21
6. Step 6: Final answer
   x = 1,485.25