Finding the Third Proportional to 3,455,789 and 7,678,591

Step by Step Solution

1. Step 1: Write the proportion equation
   3,455,789 : 7,678,591 = 7,678,591 : x
2. Step 2: Convert to fraction form
   3,455,789/7,678,591 = 7,678,591/x
3. Step 3: Cross multiply
   3,455,789x = 7,678,591 × 7,678,591
4. Step 4: Simplify right side
   3,455,789x = 58,960,759,745,281
5. Step 5: Solve for x
   x = 58,960,759,745,281/3,455,789
6. Step 6: Final answer
   x = 17,061,446.68