Finding the Fourth Proportional to 2,939.69, 4,408.88 and 859.19

Step by Step Solution

1. Step 1: Write the proportion equation
   2,939.69 : 4,408.88 = 859.19 : x
2. Step 2: Convert to fraction form
   2,939.69/4,408.88 = 859.19/x
3. Step 3: Cross multiply
   2,939.69x = 4,408.88 × 859.19
4. Step 4: Simplify right side
   2,939.69x = 3,788,061.31
5. Step 5: Solve for x
   x = 3,788,061.31/2,939.69
6. Step 6: Final answer
   x = 1,288.59