Finding the Third Proportional to 851,505 and 1,866,306

Step by Step Solution

1. Step 1: Write the proportion equation
   851,505 : 1,866,306 = 1,866,306 : x
2. Step 2: Convert to fraction form
   851,505/1,866,306 = 1,866,306/x
3. Step 3: Cross multiply
   851,505x = 1,866,306 × 1,866,306
4. Step 4: Simplify right side
   851,505x = 3,483,098,085,636
5. Step 5: Solve for x
   x = 3,483,098,085,636/851,505
6. Step 6: Final answer
   x = 4,090,519.83