Finding the Third Proportional to 139,456 and 212,448

Step by Step Solution

1. Step 1: Write the proportion equation
   139,456 : 212,448 = 212,448 : x
2. Step 2: Convert to fraction form
   139,456/212,448 = 212,448/x
3. Step 3: Cross multiply
   139,456x = 212,448 × 212,448
4. Step 4: Simplify right side
   139,456x = 45,134,152,704
5. Step 5: Solve for x
   x = 45,134,152,704/139,456
6. Step 6: Final answer
   x = 323,644.39