Finding the Third Proportional to 289,628 and 443,061

Step by Step Solution

1. Step 1: Write the proportion equation
   289,628 : 443,061 = 443,061 : x
2. Step 2: Convert to fraction form
   289,628/443,061 = 443,061/x
3. Step 3: Cross multiply
   289,628x = 443,061 × 443,061
4. Step 4: Simplify right side
   289,628x = 196,303,049,721
5. Step 5: Solve for x
   x = 196,303,049,721/289,628
6. Step 6: Final answer
   x = 677,776.49