Finding the Third Proportional to 4,909 and 10,151

Step by Step Solution

1. Step 1: Write the proportion equation
   4,909 : 10,151 = 10,151 : x
2. Step 2: Convert to fraction form
   4,909/10,151 = 10,151/x
3. Step 3: Cross multiply
   4,909x = 10,151 × 10,151
4. Step 4: Simplify right side
   4,909x = 103,042,801
5. Step 5: Solve for x
   x = 103,042,801/4,909
6. Step 6: Final answer
   x = 20,990.59