Finding the Third Proportional to 3,931,534 and 8,409,556

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931,534 : 8,409,556 = 8,409,556 : x
2. Step 2: Convert to fraction form
   3,931,534/8,409,556 = 8,409,556/x
3. Step 3: Cross multiply
   3,931,534x = 8,409,556 × 8,409,556
4. Step 4: Simplify right side
   3,931,534x = 70,720,632,117,136
5. Step 5: Solve for x
   x = 70,720,632,117,136/3,931,534
6. Step 6: Final answer
   x = 17,988,050.50