Finding the Third Proportional to 387,648 and 821,325.38

Step by Step Solution

1. Step 1: Write the proportion equation
   387,648 : 821,325.38 = 821,325.38 : x
2. Step 2: Convert to fraction form
   387,648/821,325.38 = 821,325.38/x
3. Step 3: Cross multiply
   387,648x = 821,325.38 × 821,325.38
4. Step 4: Simplify right side
   387,648x = 674,575,371,618.89
5. Step 5: Solve for x
   x = 674,575,371,618.89/387,648
6. Step 6: Final answer
   x = 1,740,175.03