Finding the Fourth Proportional to 20,485.56, 30,704.22 and 8,636.79

Step by Step Solution

1. Step 1: Write the proportion equation
   20,485.56 : 30,704.22 = 8,636.79 : x
2. Step 2: Convert to fraction form
   20,485.56/30,704.22 = 8,636.79/x
3. Step 3: Cross multiply
   20,485.56x = 30,704.22 × 8,636.79
4. Step 4: Simplify right side
   20,485.56x = 265,185,900.25
5. Step 5: Solve for x
   x = 265,185,900.25/20,485.56
6. Step 6: Final answer
   x = 12,945.02