Finding the Third Proportional to 139,352 and 212,288

Step by Step Solution

1. Step 1: Write the proportion equation
   139,352 : 212,288 = 212,288 : x
2. Step 2: Convert to fraction form
   139,352/212,288 = 212,288/x
3. Step 3: Cross multiply
   139,352x = 212,288 × 212,288
4. Step 4: Simplify right side
   139,352x = 45,066,194,944
5. Step 5: Solve for x
   x = 45,066,194,944/139,352
6. Step 6: Final answer
   x = 323,398.26