Finding the Third Proportional to 89,215.31 and 128,233.69

Step by Step Solution

1. Step 1: Write the proportion equation
   89,215.31 : 128,233.69 = 128,233.69 : x
2. Step 2: Convert to fraction form
   89,215.31/128,233.69 = 128,233.69/x
3. Step 3: Cross multiply
   89,215.31x = 128,233.69 × 128,233.69
4. Step 4: Simplify right side
   89,215.31x = 16,443,878,609.85
5. Step 5: Solve for x
   x = 16,443,878,609.85/89,215.31
6. Step 6: Final answer
   x = 184,316.77