Finding the Third Proportional to 139,341 and 213,508

Step by Step Solution

1. Step 1: Write the proportion equation
   139,341 : 213,508 = 213,508 : x
2. Step 2: Convert to fraction form
   139,341/213,508 = 213,508/x
3. Step 3: Cross multiply
   139,341x = 213,508 × 213,508
4. Step 4: Simplify right side
   139,341x = 45,585,666,064
5. Step 5: Solve for x
   x = 45,585,666,064/139,341
6. Step 6: Final answer
   x = 327,151.85