Finding the Third Proportional to 57,910 and 89,610

Step by Step Solution

1. Step 1: Write the proportion equation
   57,910 : 89,610 = 89,610 : x
2. Step 2: Convert to fraction form
   57,910/89,610 = 89,610/x
3. Step 3: Cross multiply
   57,910x = 89,610 × 89,610
4. Step 4: Simplify right side
   57,910x = 8,029,952,100
5. Step 5: Solve for x
   x = 8,029,952,100/57,910
6. Step 6: Final answer
   x = 138,662.62