Finding the Third Proportional to 72,638 and 108,921

Step by Step Solution

1. Step 1: Write the proportion equation
   72,638 : 108,921 = 108,921 : x
2. Step 2: Convert to fraction form
   72,638/108,921 = 108,921/x
3. Step 3: Cross multiply
   72,638x = 108,921 × 108,921
4. Step 4: Simplify right side
   72,638x = 11,863,784,241
5. Step 5: Solve for x
   x = 11,863,784,241/72,638
6. Step 6: Final answer
   x = 163,327.52