Finding the Fourth Proportional to 21,821.33, 30,116.25 and 13,321.67

Step by Step Solution

1. Step 1: Write the proportion equation
   21,821.33 : 30,116.25 = 13,321.67 : x
2. Step 2: Convert to fraction form
   21,821.33/30,116.25 = 13,321.67/x
3. Step 3: Cross multiply
   21,821.33x = 30,116.25 × 13,321.67
4. Step 4: Simplify right side
   21,821.33x = 401,198,677.53
5. Step 5: Solve for x
   x = 401,198,677.53/21,821.33
6. Step 6: Final answer
   x = 18,385.62