Finding the Fourth Proportional to 2,550.66, 3,825.18 and 990.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,550.66 : 3,825.18 = 990.55 : x
2. Step 2: Convert to fraction form
   2,550.66/3,825.18 = 990.55/x
3. Step 3: Cross multiply
   2,550.66x = 3,825.18 × 990.55
4. Step 4: Simplify right side
   2,550.66x = 3,789,032.05
5. Step 5: Solve for x
   x = 3,789,032.05/2,550.66
6. Step 6: Final answer
   x = 1,485.51