Finding the Third Proportional to 289,819 and 443,373

Step by Step Solution

1. Step 1: Write the proportion equation
   289,819 : 443,373 = 443,373 : x
2. Step 2: Convert to fraction form
   289,819/443,373 = 443,373/x
3. Step 3: Cross multiply
   289,819x = 443,373 × 443,373
4. Step 4: Simplify right side
   289,819x = 196,579,617,129
5. Step 5: Solve for x
   x = 196,579,617,129/289,819
6. Step 6: Final answer
   x = 678,284.09