Finding the Fourth Proportional to 21,022.09, 31,535.30 and 12,147.37

Step by Step Solution

1. Step 1: Write the proportion equation
   21,022.09 : 31,535.30 = 12,147.37 : x
2. Step 2: Convert to fraction form
   21,022.09/31,535.30 = 12,147.37/x
3. Step 3: Cross multiply
   21,022.09x = 31,535.30 × 12,147.37
4. Step 4: Simplify right side
   21,022.09x = 383,070,957.16
5. Step 5: Solve for x
   x = 383,070,957.16/21,022.09
6. Step 6: Final answer
   x = 18,222.31