Finding the Fourth Proportional to 2,300.21, 3,449.94 and 839.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,300.21 : 3,449.94 = 839.36 : x
2. Step 2: Convert to fraction form
   2,300.21/3,449.94 = 839.36/x
3. Step 3: Cross multiply
   2,300.21x = 3,449.94 × 839.36
4. Step 4: Simplify right side
   2,300.21x = 2,895,724.39
5. Step 5: Solve for x
   x = 2,895,724.39/2,300.21
6. Step 6: Final answer
   x = 1,258.90