Finding the Third Proportional to 139,300 and 212,206

Step by Step Solution

1. Step 1: Write the proportion equation
   139,300 : 212,206 = 212,206 : x
2. Step 2: Convert to fraction form
   139,300/212,206 = 212,206/x
3. Step 3: Cross multiply
   139,300x = 212,206 × 212,206
4. Step 4: Simplify right side
   139,300x = 45,031,386,436
5. Step 5: Solve for x
   x = 45,031,386,436/139,300
6. Step 6: Final answer
   x = 323,269.11