Finding the Third Proportional to 139,131 and 300,495

Step by Step Solution

1. Step 1: Write the proportion equation
   139,131 : 300,495 = 300,495 : x
2. Step 2: Convert to fraction form
   139,131/300,495 = 300,495/x
3. Step 3: Cross multiply
   139,131x = 300,495 × 300,495
4. Step 4: Simplify right side
   139,131x = 90,297,245,025
5. Step 5: Solve for x
   x = 90,297,245,025/139,131
6. Step 6: Final answer
   x = 649,008.81