Finding the Third Proportional to 300,836 and 641,704

Step by Step Solution

1. Step 1: Write the proportion equation
   300,836 : 641,704 = 641,704 : x
2. Step 2: Convert to fraction form
   300,836/641,704 = 641,704/x
3. Step 3: Cross multiply
   300,836x = 641,704 × 641,704
4. Step 4: Simplify right side
   300,836x = 411,784,023,616
5. Step 5: Solve for x
   x = 411,784,023,616/300,836
6. Step 6: Final answer
   x = 1,368,799.03