Finding the Third Proportional to 139,276 and 209,223

Step by Step Solution

1. Step 1: Write the proportion equation
   139,276 : 209,223 = 209,223 : x
2. Step 2: Convert to fraction form
   139,276/209,223 = 209,223/x
3. Step 3: Cross multiply
   139,276x = 209,223 × 209,223
4. Step 4: Simplify right side
   139,276x = 43,774,263,729
5. Step 5: Solve for x
   x = 43,774,263,729/139,276
6. Step 6: Final answer
   x = 314,298.69