Finding the Fourth Proportional to 12,170.72, 18,251.22 and 5,153.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,170.72 : 18,251.22 = 5,153.96 : x
2. Step 2: Convert to fraction form
   12,170.72/18,251.22 = 5,153.96/x
3. Step 3: Cross multiply
   12,170.72x = 18,251.22 × 5,153.96
4. Step 4: Simplify right side
   12,170.72x = 94,066,057.83
5. Step 5: Solve for x
   x = 94,066,057.83/12,170.72
6. Step 6: Final answer
   x = 7,728.88