Finding the Third Proportional to 89,215.50 and 128,234.25

Step by Step Solution

1. Step 1: Write the proportion equation
   89,215.50 : 128,234.25 = 128,234.25 : x
2. Step 2: Convert to fraction form
   89,215.50/128,234.25 = 128,234.25/x
3. Step 3: Cross multiply
   89,215.50x = 128,234.25 × 128,234.25
4. Step 4: Simplify right side
   89,215.50x = 16,444,022,873.06
5. Step 5: Solve for x
   x = 16,444,022,873.06/89,215.50
6. Step 6: Final answer
   x = 184,318.00