Finding the Third Proportional to 139,336 and 212,264

Step by Step Solution

1. Step 1: Write the proportion equation
   139,336 : 212,264 = 212,264 : x
2. Step 2: Convert to fraction form
   139,336/212,264 = 212,264/x
3. Step 3: Cross multiply
   139,336x = 212,264 × 212,264
4. Step 4: Simplify right side
   139,336x = 45,056,005,696
5. Step 5: Solve for x
   x = 45,056,005,696/139,336
6. Step 6: Final answer
   x = 323,362.27