Finding the Third Proportional to 164,308.50 and 336,388.50

Step by Step Solution

1. Step 1: Write the proportion equation
   164,308.50 : 336,388.50 = 336,388.50 : x
2. Step 2: Convert to fraction form
   164,308.50/336,388.50 = 336,388.50/x
3. Step 3: Cross multiply
   164,308.50x = 336,388.50 × 336,388.50
4. Step 4: Simplify right side
   164,308.50x = 113,157,222,932.25
5. Step 5: Solve for x
   x = 113,157,222,932.25/164,308.50
6. Step 6: Final answer
   x = 688,687.58