Finding the Third Proportional to 290,156 and 443,568

Step by Step Solution

1. Step 1: Write the proportion equation
   290,156 : 443,568 = 443,568 : x
2. Step 2: Convert to fraction form
   290,156/443,568 = 443,568/x
3. Step 3: Cross multiply
   290,156x = 443,568 × 443,568
4. Step 4: Simplify right side
   290,156x = 196,752,570,624
5. Step 5: Solve for x
   x = 196,752,570,624/290,156
6. Step 6: Final answer
   x = 678,092.37