Finding the Fourth Proportional to 2,939.39, 4,409.37 and 859.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,939.39 : 4,409.37 = 859.42 : x
2. Step 2: Convert to fraction form
   2,939.39/4,409.37 = 859.42/x
3. Step 3: Cross multiply
   2,939.39x = 4,409.37 × 859.42
4. Step 4: Simplify right side
   2,939.39x = 3,789,478.72
5. Step 5: Solve for x
   x = 3,789,478.72/2,939.39
6. Step 6: Final answer
   x = 1,289.21