Finding the Third Proportional to 139,086 and 300,345

Step by Step Solution

1. Step 1: Write the proportion equation
   139,086 : 300,345 = 300,345 : x
2. Step 2: Convert to fraction form
   139,086/300,345 = 300,345/x
3. Step 3: Cross multiply
   139,086x = 300,345 × 300,345
4. Step 4: Simplify right side
   139,086x = 90,207,119,025
5. Step 5: Solve for x
   x = 90,207,119,025/139,086
6. Step 6: Final answer
   x = 648,570.81