Finding the Third Proportional to 3,945,397 and 8,490,031

Step by Step Solution

1. Step 1: Write the proportion equation
   3,945,397 : 8,490,031 = 8,490,031 : x
2. Step 2: Convert to fraction form
   3,945,397/8,490,031 = 8,490,031/x
3. Step 3: Cross multiply
   3,945,397x = 8,490,031 × 8,490,031
4. Step 4: Simplify right side
   3,945,397x = 72,080,626,380,961
5. Step 5: Solve for x
   x = 72,080,626,380,961/3,945,397
6. Step 6: Final answer
   x = 18,269,549.65