Finding the Third Proportional to 309,606 and 632,328

Step by Step Solution

1. Step 1: Write the proportion equation
   309,606 : 632,328 = 632,328 : x
2. Step 2: Convert to fraction form
   309,606/632,328 = 632,328/x
3. Step 3: Cross multiply
   309,606x = 632,328 × 632,328
4. Step 4: Simplify right side
   309,606x = 399,838,699,584
5. Step 5: Solve for x
   x = 399,838,699,584/309,606
6. Step 6: Final answer
   x = 1,291,443.64