Finding the Third Proportional to 311,953 and 638,662

Step by Step Solution

1. Step 1: Write the proportion equation
   311,953 : 638,662 = 638,662 : x
2. Step 2: Convert to fraction form
   311,953/638,662 = 638,662/x
3. Step 3: Cross multiply
   311,953x = 638,662 × 638,662
4. Step 4: Simplify right side
   311,953x = 407,889,150,244
5. Step 5: Solve for x
   x = 407,889,150,244/311,953
6. Step 6: Final answer
   x = 1,307,533.99