Finding the Third Proportional to 72,210 and 108,630

Step by Step Solution

1. Step 1: Write the proportion equation
   72,210 : 108,630 = 108,630 : x
2. Step 2: Convert to fraction form
   72,210/108,630 = 108,630/x
3. Step 3: Cross multiply
   72,210x = 108,630 × 108,630
4. Step 4: Simplify right side
   72,210x = 11,800,476,900
5. Step 5: Solve for x
   x = 11,800,476,900/72,210
6. Step 6: Final answer
   x = 163,418.87