Finding the Fourth Proportional to 12,162.89, 18,156.38 and 10,686.67

Step by Step Solution

1. Step 1: Write the proportion equation
   12,162.89 : 18,156.38 = 10,686.67 : x
2. Step 2: Convert to fraction form
   12,162.89/18,156.38 = 10,686.67/x
3. Step 3: Cross multiply
   12,162.89x = 18,156.38 × 10,686.67
4. Step 4: Simplify right side
   12,162.89x = 194,031,142.63
5. Step 5: Solve for x
   x = 194,031,142.63/12,162.89
6. Step 6: Final answer
   x = 15,952.71