Finding the Fourth Proportional to 2,839.52, 4,258.22 and 990.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,839.52 : 4,258.22 = 990.12 : x
2. Step 2: Convert to fraction form
   2,839.52/4,258.22 = 990.12/x
3. Step 3: Cross multiply
   2,839.52x = 4,258.22 × 990.12
4. Step 4: Simplify right side
   2,839.52x = 4,216,148.79
5. Step 5: Solve for x
   x = 4,216,148.79/2,839.52
6. Step 6: Final answer
   x = 1,484.81