Finding the Fourth Proportional to 9,667.72, 14,516.70 and 8,216.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,667.72 : 14,516.70 = 8,216.20 : x
2. Step 2: Convert to fraction form
   9,667.72/14,516.70 = 8,216.20/x
3. Step 3: Cross multiply
   9,667.72x = 14,516.70 × 8,216.20
4. Step 4: Simplify right side
   9,667.72x = 119,272,110.54
5. Step 5: Solve for x
   x = 119,272,110.54/9,667.72
6. Step 6: Final answer
   x = 12,337.15