Finding the Third Proportional to 89,689.50 and 121,860

Step by Step Solution

1. Step 1: Write the proportion equation
   89,689.50 : 121,860 = 121,860 : x
2. Step 2: Convert to fraction form
   89,689.50/121,860 = 121,860/x
3. Step 3: Cross multiply
   89,689.50x = 121,860 × 121,860
4. Step 4: Simplify right side
   89,689.50x = 14,849,859,600
5. Step 5: Solve for x
   x = 14,849,859,600/89,689.50
6. Step 6: Final answer
   x = 165,569.66