Finding the Third Proportional to 139,274 and 212,175

Step by Step Solution

1. Step 1: Write the proportion equation
   139,274 : 212,175 = 212,175 : x
2. Step 2: Convert to fraction form
   139,274/212,175 = 212,175/x
3. Step 3: Cross multiply
   139,274x = 212,175 × 212,175
4. Step 4: Simplify right side
   139,274x = 45,018,230,625
5. Step 5: Solve for x
   x = 45,018,230,625/139,274
6. Step 6: Final answer
   x = 323,234.99