Finding the Fourth Proportional to 8,706.78, 12,015.62 and 4,728.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,706.78 : 12,015.62 = 4,728.15 : x
2. Step 2: Convert to fraction form
   8,706.78/12,015.62 = 4,728.15/x
3. Step 3: Cross multiply
   8,706.78x = 12,015.62 × 4,728.15
4. Step 4: Simplify right side
   8,706.78x = 56,811,630.06
5. Step 5: Solve for x
   x = 56,811,630.06/8,706.78
6. Step 6: Final answer
   x = 6,524.99