Finding the Third Proportional to 139,404 and 213,288

Step by Step Solution

1. Step 1: Write the proportion equation
   139,404 : 213,288 = 213,288 : x
2. Step 2: Convert to fraction form
   139,404/213,288 = 213,288/x
3. Step 3: Cross multiply
   139,404x = 213,288 × 213,288
4. Step 4: Simplify right side
   139,404x = 45,491,770,944
5. Step 5: Solve for x
   x = 45,491,770,944/139,404
6. Step 6: Final answer
   x = 326,330.46