Finding the Fourth Proportional to 2,939.89, 4,410.12 and 859.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,939.89 : 4,410.12 = 859.92 : x
2. Step 2: Convert to fraction form
   2,939.89/4,410.12 = 859.92/x
3. Step 3: Cross multiply
   2,939.89x = 4,410.12 × 859.92
4. Step 4: Simplify right side
   2,939.89x = 3,792,350.39
5. Step 5: Solve for x
   x = 3,792,350.39/2,939.89
6. Step 6: Final answer
   x = 1,289.96