Finding the Fourth Proportional to 2,321.46, 3,480.18 and 839.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,321.46 : 3,480.18 = 839.76 : x
2. Step 2: Convert to fraction form
   2,321.46/3,480.18 = 839.76/x
3. Step 3: Cross multiply
   2,321.46x = 3,480.18 × 839.76
4. Step 4: Simplify right side
   2,321.46x = 2,922,515.96
5. Step 5: Solve for x
   x = 2,922,515.96/2,321.46
6. Step 6: Final answer
   x = 1,258.91