Finding the Fourth Proportional to 2,839.50, 4,258.54 and 990.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,839.50 : 4,258.54 = 990.34 : x
2. Step 2: Convert to fraction form
   2,839.50/4,258.54 = 990.34/x
3. Step 3: Cross multiply
   2,839.50x = 4,258.54 × 990.34
4. Step 4: Simplify right side
   2,839.50x = 4,217,402.50
5. Step 5: Solve for x
   x = 4,217,402.50/2,839.50
6. Step 6: Final answer
   x = 1,485.26