Finding the Fourth Proportional to 22,172.78, 30,597.67 and 13,215.67

Step by Step Solution

1. Step 1: Write the proportion equation
   22,172.78 : 30,597.67 = 13,215.67 : x
2. Step 2: Convert to fraction form
   22,172.78/30,597.67 = 13,215.67/x
3. Step 3: Cross multiply
   22,172.78x = 30,597.67 × 13,215.67
4. Step 4: Simplify right side
   22,172.78x = 404,368,709.49
5. Step 5: Solve for x
   x = 404,368,709.49/22,172.78
6. Step 6: Final answer
   x = 18,237.17