Finding the Fourth Proportional to 16,688.72, 23,028.36 and 9,238.16

Step by Step Solution

1. Step 1: Write the proportion equation
   16,688.72 : 23,028.36 = 9,238.16 : x
2. Step 2: Convert to fraction form
   16,688.72/23,028.36 = 9,238.16/x
3. Step 3: Cross multiply
   16,688.72x = 23,028.36 × 9,238.16
4. Step 4: Simplify right side
   16,688.72x = 212,739,674.22
5. Step 5: Solve for x
   x = 212,739,674.22/16,688.72
6. Step 6: Final answer
   x = 12,747.51