Finding the Fourth Proportional to 2,225.85, 3,339.24 and 839.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,225.85 : 3,339.24 = 839.15 : x
2. Step 2: Convert to fraction form
   2,225.85/3,339.24 = 839.15/x
3. Step 3: Cross multiply
   2,225.85x = 3,339.24 × 839.15
4. Step 4: Simplify right side
   2,225.85x = 2,802,123.25
5. Step 5: Solve for x
   x = 2,802,123.25/2,225.85
6. Step 6: Final answer
   x = 1,258.90