Finding the Third Proportional to 328,647 and 707,109

Step by Step Solution

1. Step 1: Write the proportion equation
   328,647 : 707,109 = 707,109 : x
2. Step 2: Convert to fraction form
   328,647/707,109 = 707,109/x
3. Step 3: Cross multiply
   328,647x = 707,109 × 707,109
4. Step 4: Simplify right side
   328,647x = 500,003,137,881
5. Step 5: Solve for x
   x = 500,003,137,881/328,647
6. Step 6: Final answer
   x = 1,521,398.76