Finding the Third Proportional to 57,900 and 86,606

Step by Step Solution

1. Step 1: Write the proportion equation
   57,900 : 86,606 = 86,606 : x
2. Step 2: Convert to fraction form
   57,900/86,606 = 86,606/x
3. Step 3: Cross multiply
   57,900x = 86,606 × 86,606
4. Step 4: Simplify right side
   57,900x = 7,500,599,236
5. Step 5: Solve for x
   x = 7,500,599,236/57,900
6. Step 6: Final answer
   x = 129,544.03