Finding the Fourth Proportional to 21,227, 31,616.27 and 20,116.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,227 : 31,616.27 = 20,116.76 : x
2. Step 2: Convert to fraction form
   21,227/31,616.27 = 20,116.76/x
3. Step 3: Cross multiply
   21,227x = 31,616.27 × 20,116.76
4. Step 4: Simplify right side
   21,227x = 636,016,915.69
5. Step 5: Solve for x
   x = 636,016,915.69/21,227
6. Step 6: Final answer
   x = 29,962.64