Finding the Fourth Proportional to 8,485.59, 12,728.37 and 4,786.14

Step by Step Solution

1. Step 1: Write the proportion equation
   8,485.59 : 12,728.37 = 4,786.14 : x
2. Step 2: Convert to fraction form
   8,485.59/12,728.37 = 4,786.14/x
3. Step 3: Cross multiply
   8,485.59x = 12,728.37 × 4,786.14
4. Step 4: Simplify right side
   8,485.59x = 60,919,760.79
5. Step 5: Solve for x
   x = 60,919,760.79/8,485.59
6. Step 6: Final answer
   x = 7,179.20