Finding the Fourth Proportional to 12,667.16, 18,921.72 and 9,386.64

Step by Step Solution

1. Step 1: Write the proportion equation
   12,667.16 : 18,921.72 = 9,386.64 : x
2. Step 2: Convert to fraction form
   12,667.16/18,921.72 = 9,386.64/x
3. Step 3: Cross multiply
   12,667.16x = 18,921.72 × 9,386.64
4. Step 4: Simplify right side
   12,667.16x = 177,611,373.82
5. Step 5: Solve for x
   x = 177,611,373.82/12,667.16
6. Step 6: Final answer
   x = 14,021.40