Finding the Third Proportional to 139,448 and 213,357

Step by Step Solution

1. Step 1: Write the proportion equation
   139,448 : 213,357 = 213,357 : x
2. Step 2: Convert to fraction form
   139,448/213,357 = 213,357/x
3. Step 3: Cross multiply
   139,448x = 213,357 × 213,357
4. Step 4: Simplify right side
   139,448x = 45,521,209,449
5. Step 5: Solve for x
   x = 45,521,209,449/139,448
6. Step 6: Final answer
   x = 326,438.60