Finding the Fourth Proportional to 21,222.55, 31,818.57 and 9,971.54

Step by Step Solution

1. Step 1: Write the proportion equation
   21,222.55 : 31,818.57 = 9,971.54 : x
2. Step 2: Convert to fraction form
   21,222.55/31,818.57 = 9,971.54/x
3. Step 3: Cross multiply
   21,222.55x = 31,818.57 × 9,971.54
4. Step 4: Simplify right side
   21,222.55x = 317,280,143.50
5. Step 5: Solve for x
   x = 317,280,143.50/21,222.55
6. Step 6: Final answer
   x = 14,950.15