Finding the Third Proportional to 89,636 and 121,800

Step by Step Solution

1. Step 1: Write the proportion equation
   89,636 : 121,800 = 121,800 : x
2. Step 2: Convert to fraction form
   89,636/121,800 = 121,800/x
3. Step 3: Cross multiply
   89,636x = 121,800 × 121,800
4. Step 4: Simplify right side
   89,636x = 14,835,240,000
5. Step 5: Solve for x
   x = 14,835,240,000/89,636
6. Step 6: Final answer
   x = 165,505.38