Finding the Third Proportional to 395,992.50 and 810,438

Step by Step Solution

1. Step 1: Write the proportion equation
   395,992.50 : 810,438 = 810,438 : x
2. Step 2: Convert to fraction form
   395,992.50/810,438 = 810,438/x
3. Step 3: Cross multiply
   395,992.50x = 810,438 × 810,438
4. Step 4: Simplify right side
   395,992.50x = 656,809,751,844
5. Step 5: Solve for x
   x = 656,809,751,844/395,992.50
6. Step 6: Final answer
   x = 1,658,641.90