Finding the Fourth Proportional to 21,723.81, 29,971.89 and 12,162.29

Step by Step Solution

1. Step 1: Write the proportion equation
   21,723.81 : 29,971.89 = 12,162.29 : x
2. Step 2: Convert to fraction form
   21,723.81/29,971.89 = 12,162.29/x
3. Step 3: Cross multiply
   21,723.81x = 29,971.89 × 12,162.29
4. Step 4: Simplify right side
   21,723.81x = 364,526,836.76
5. Step 5: Solve for x
   x = 364,526,836.76/21,723.81
6. Step 6: Final answer
   x = 16,780.06