Finding the Third Proportional to 64,980 and 139,628

Step by Step Solution

1. Step 1: Write the proportion equation
   64,980 : 139,628 = 139,628 : x
2. Step 2: Convert to fraction form
   64,980/139,628 = 139,628/x
3. Step 3: Cross multiply
   64,980x = 139,628 × 139,628
4. Step 4: Simplify right side
   64,980x = 19,495,978,384
5. Step 5: Solve for x
   x = 19,495,978,384/64,980
6. Step 6: Final answer
   x = 300,030.45