Finding the Fourth Proportional to 2,878.45, 3,968.82 and 2,039.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,878.45 : 3,968.82 = 2,039.29 : x
2. Step 2: Convert to fraction form
   2,878.45/3,968.82 = 2,039.29/x
3. Step 3: Cross multiply
   2,878.45x = 3,968.82 × 2,039.29
4. Step 4: Simplify right side
   2,878.45x = 8,093,544.90
5. Step 5: Solve for x
   x = 8,093,544.90/2,878.45
6. Step 6: Final answer
   x = 2,811.78