Finding the Fourth Proportional to 8,578.34, 12,865.98 and 4,627.76

Step by Step Solution

1. Step 1: Write the proportion equation
   8,578.34 : 12,865.98 = 4,627.76 : x
2. Step 2: Convert to fraction form
   8,578.34/12,865.98 = 4,627.76/x
3. Step 3: Cross multiply
   8,578.34x = 12,865.98 × 4,627.76
4. Step 4: Simplify right side
   8,578.34x = 59,540,667.60
5. Step 5: Solve for x
   x = 59,540,667.60/8,578.34
6. Step 6: Final answer
   x = 6,940.81