Finding the Third Proportional to 89,115 and 129,661.50

Step by Step Solution

1. Step 1: Write the proportion equation
   89,115 : 129,661.50 = 129,661.50 : x
2. Step 2: Convert to fraction form
   89,115/129,661.50 = 129,661.50/x
3. Step 3: Cross multiply
   89,115x = 129,661.50 × 129,661.50
4. Step 4: Simplify right side
   89,115x = 16,812,104,582.25
5. Step 5: Solve for x
   x = 16,812,104,582.25/89,115
6. Step 6: Final answer
   x = 188,656.28