Finding the Third Proportional to 3,937,290 and 8,420,556

Step by Step Solution

1. Step 1: Write the proportion equation
   3,937,290 : 8,420,556 = 8,420,556 : x
2. Step 2: Convert to fraction form
   3,937,290/8,420,556 = 8,420,556/x
3. Step 3: Cross multiply
   3,937,290x = 8,420,556 × 8,420,556
4. Step 4: Simplify right side
   3,937,290x = 70,905,763,349,136
5. Step 5: Solve for x
   x = 70,905,763,349,136/3,937,290
6. Step 6: Final answer
   x = 18,008,773.38