Finding the Third Proportional to 407,739 and 629,419.50

Step by Step Solution

1. Step 1: Write the proportion equation
   407,739 : 629,419.50 = 629,419.50 : x
2. Step 2: Convert to fraction form
   407,739/629,419.50 = 629,419.50/x
3. Step 3: Cross multiply
   407,739x = 629,419.50 × 629,419.50
4. Step 4: Simplify right side
   407,739x = 396,168,906,980.25
5. Step 5: Solve for x
   x = 396,168,906,980.25/407,739
6. Step 6: Final answer
   x = 971,623.78