Finding the Third Proportional to 395,986.50 and 810,426

Step by Step Solution

1. Step 1: Write the proportion equation
   395,986.50 : 810,426 = 810,426 : x
2. Step 2: Convert to fraction form
   395,986.50/810,426 = 810,426/x
3. Step 3: Cross multiply
   395,986.50x = 810,426 × 810,426
4. Step 4: Simplify right side
   395,986.50x = 656,790,301,476
5. Step 5: Solve for x
   x = 656,790,301,476/395,986.50
6. Step 6: Final answer
   x = 1,658,617.91