Finding the Third Proportional to 295,434 and 644,321.25

Step by Step Solution

1. Step 1: Write the proportion equation
   295,434 : 644,321.25 = 644,321.25 : x
2. Step 2: Convert to fraction form
   295,434/644,321.25 = 644,321.25/x
3. Step 3: Cross multiply
   295,434x = 644,321.25 × 644,321.25
4. Step 4: Simplify right side
   295,434x = 415,149,873,201.56
5. Step 5: Solve for x
   x = 415,149,873,201.56/295,434
6. Step 6: Final answer
   x = 1,405,220.36