Finding the Third Proportional to 3,945,398 and 8,490,032

Step by Step Solution

1. Step 1: Write the proportion equation
   3,945,398 : 8,490,032 = 8,490,032 : x
2. Step 2: Convert to fraction form
   3,945,398/8,490,032 = 8,490,032/x
3. Step 3: Cross multiply
   3,945,398x = 8,490,032 × 8,490,032
4. Step 4: Simplify right side
   3,945,398x = 72,080,643,361,024
5. Step 5: Solve for x
   x = 72,080,643,361,024/3,945,398
6. Step 6: Final answer
   x = 18,269,549.32