Finding the Third Proportional to 64,705 and 139,245

Step by Step Solution

1. Step 1: Write the proportion equation
   64,705 : 139,245 = 139,245 : x
2. Step 2: Convert to fraction form
   64,705/139,245 = 139,245/x
3. Step 3: Cross multiply
   64,705x = 139,245 × 139,245
4. Step 4: Simplify right side
   64,705x = 19,389,170,025
5. Step 5: Solve for x
   x = 19,389,170,025/64,705
6. Step 6: Final answer
   x = 299,654.90