Finding the Third Proportional to 3,945,790 and 9,219,144

Step by Step Solution

1. Step 1: Write the proportion equation
   3,945,790 : 9,219,144 = 9,219,144 : x
2. Step 2: Convert to fraction form
   3,945,790/9,219,144 = 9,219,144/x
3. Step 3: Cross multiply
   3,945,790x = 9,219,144 × 9,219,144
4. Step 4: Simplify right side
   3,945,790x = 84,992,616,092,736
5. Step 5: Solve for x
   x = 84,992,616,092,736/3,945,790
6. Step 6: Final answer
   x = 21,540,075.90