Finding the Third Proportional to 164,308 and 336,386

Step by Step Solution

1. Step 1: Write the proportion equation
   164,308 : 336,386 = 336,386 : x
2. Step 2: Convert to fraction form
   164,308/336,386 = 336,386/x
3. Step 3: Cross multiply
   164,308x = 336,386 × 336,386
4. Step 4: Simplify right side
   164,308x = 113,155,540,996
5. Step 5: Solve for x
   x = 113,155,540,996/164,308
6. Step 6: Final answer
   x = 688,679.44