Finding the Third Proportional to 859,447 and 1,821,345

Step by Step Solution

1. Step 1: Write the proportion equation
   859,447 : 1,821,345 = 1,821,345 : x
2. Step 2: Convert to fraction form
   859,447/1,821,345 = 1,821,345/x
3. Step 3: Cross multiply
   859,447x = 1,821,345 × 1,821,345
4. Step 4: Simplify right side
   859,447x = 3,317,297,609,025
5. Step 5: Solve for x
   x = 3,317,297,609,025/859,447
6. Step 6: Final answer
   x = 3,859,804.75