Finding the Third Proportional to 309,636 and 632,392

Step by Step Solution

1. Step 1: Write the proportion equation
   309,636 : 632,392 = 632,392 : x
2. Step 2: Convert to fraction form
   309,636/632,392 = 632,392/x
3. Step 3: Cross multiply
   309,636x = 632,392 × 632,392
4. Step 4: Simplify right side
   309,636x = 399,919,641,664
5. Step 5: Solve for x
   x = 399,919,641,664/309,636
6. Step 6: Final answer
   x = 1,291,579.93