Finding the Fourth Proportional to 2,550.15, 3,825.27 and 989.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,550.15 : 3,825.27 = 989.99 : x
2. Step 2: Convert to fraction form
   2,550.15/3,825.27 = 989.99/x
3. Step 3: Cross multiply
   2,550.15x = 3,825.27 × 989.99
4. Step 4: Simplify right side
   2,550.15x = 3,786,959.92
5. Step 5: Solve for x
   x = 3,786,959.92/2,550.15
6. Step 6: Final answer
   x = 1,484.99