Finding the Fourth Proportional to 8,662.82, 12,968.30 and 5,578.34

Step by Step Solution

1. Step 1: Write the proportion equation
   8,662.82 : 12,968.30 = 5,578.34 : x
2. Step 2: Convert to fraction form
   8,662.82/12,968.30 = 5,578.34/x
3. Step 3: Cross multiply
   8,662.82x = 12,968.30 × 5,578.34
4. Step 4: Simplify right side
   8,662.82x = 72,341,535.73
5. Step 5: Solve for x
   x = 72,341,535.73/8,662.82
6. Step 6: Final answer
   x = 8,350.81