Finding the Third Proportional to 309,588.75 and 632,297.25

Step by Step Solution

1. Step 1: Write the proportion equation
   309,588.75 : 632,297.25 = 632,297.25 : x
2. Step 2: Convert to fraction form
   309,588.75/632,297.25 = 632,297.25/x
3. Step 3: Cross multiply
   309,588.75x = 632,297.25 × 632,297.25
4. Step 4: Simplify right side
   309,588.75x = 399,799,812,357.56
5. Step 5: Solve for x
   x = 399,799,812,357.56/309,588.75
6. Step 6: Final answer
   x = 1,291,389.99