Finding the Third Proportional to 139,434 and 213,336

Step by Step Solution

1. Step 1: Write the proportion equation
   139,434 : 213,336 = 213,336 : x
2. Step 2: Convert to fraction form
   139,434/213,336 = 213,336/x
3. Step 3: Cross multiply
   139,434x = 213,336 × 213,336
4. Step 4: Simplify right side
   139,434x = 45,512,248,896
5. Step 5: Solve for x
   x = 45,512,248,896/139,434
6. Step 6: Final answer
   x = 326,407.11