Finding the Fourth Proportional to 12,172.72, 18,245.76 and 8,015.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,172.72 : 18,245.76 = 8,015.56 : x
2. Step 2: Convert to fraction form
   12,172.72/18,245.76 = 8,015.56/x
3. Step 3: Cross multiply
   12,172.72x = 18,245.76 × 8,015.56
4. Step 4: Simplify right side
   12,172.72x = 146,249,984.03
5. Step 5: Solve for x
   x = 146,249,984.03/12,172.72
6. Step 6: Final answer
   x = 12,014.57