Finding the Third Proportional to 1,821,998 and 3,987,221

Step by Step Solution

1. Step 1: Write the proportion equation
   1,821,998 : 3,987,221 = 3,987,221 : x
2. Step 2: Convert to fraction form
   1,821,998/3,987,221 = 3,987,221/x
3. Step 3: Cross multiply
   1,821,998x = 3,987,221 × 3,987,221
4. Step 4: Simplify right side
   1,821,998x = 15,897,931,302,841
5. Step 5: Solve for x
   x = 15,897,931,302,841/1,821,998
6. Step 6: Final answer
   x = 8,725,548.16