Finding the Third Proportional to 139,348 and 212,298

Step by Step Solution

1. Step 1: Write the proportion equation
   139,348 : 212,298 = 212,298 : x
2. Step 2: Convert to fraction form
   139,348/212,298 = 212,298/x
3. Step 3: Cross multiply
   139,348x = 212,298 × 212,298
4. Step 4: Simplify right side
   139,348x = 45,070,440,804
5. Step 5: Solve for x
   x = 45,070,440,804/139,348
6. Step 6: Final answer
   x = 323,438.02