Finding the Fourth Proportional to 21,723.34, 29,981.42 and 13,766.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,723.34 : 29,981.42 = 13,766.30 : x
2. Step 2: Convert to fraction form
   21,723.34/29,981.42 = 13,766.30/x
3. Step 3: Cross multiply
   21,723.34x = 29,981.42 × 13,766.30
4. Step 4: Simplify right side
   21,723.34x = 412,733,222.15
5. Step 5: Solve for x
   x = 412,733,222.15/21,723.34
6. Step 6: Final answer
   x = 18,999.53