Finding the Fourth Proportional to 21,116.89, 29,144.40 and 12,162.67

Step by Step Solution

1. Step 1: Write the proportion equation
   21,116.89 : 29,144.40 = 12,162.67 : x
2. Step 2: Convert to fraction form
   21,116.89/29,144.40 = 12,162.67/x
3. Step 3: Cross multiply
   21,116.89x = 29,144.40 × 12,162.67
4. Step 4: Simplify right side
   21,116.89x = 354,473,719.55
5. Step 5: Solve for x
   x = 354,473,719.55/21,116.89
6. Step 6: Final answer
   x = 16,786.27