Finding the Third Proportional to 3,455,778 and 7,678,569

Step by Step Solution

1. Step 1: Write the proportion equation
   3,455,778 : 7,678,569 = 7,678,569 : x
2. Step 2: Convert to fraction form
   3,455,778/7,678,569 = 7,678,569/x
3. Step 3: Cross multiply
   3,455,778x = 7,678,569 × 7,678,569
4. Step 4: Simplify right side
   3,455,778x = 58,960,421,887,761
5. Step 5: Solve for x
   x = 58,960,421,887,761/3,455,778
6. Step 6: Final answer
   x = 17,061,403.22