Finding the Third Proportional to 139,446 and 213,354

Step by Step Solution

1. Step 1: Write the proportion equation
   139,446 : 213,354 = 213,354 : x
2. Step 2: Convert to fraction form
   139,446/213,354 = 213,354/x
3. Step 3: Cross multiply
   139,446x = 213,354 × 213,354
4. Step 4: Simplify right side
   139,446x = 45,519,929,316
5. Step 5: Solve for x
   x = 45,519,929,316/139,446
6. Step 6: Final answer
   x = 326,434.10