Finding the Third Proportional to 289,848 and 443,391

Step by Step Solution

1. Step 1: Write the proportion equation
   289,848 : 443,391 = 443,391 : x
2. Step 2: Convert to fraction form
   289,848/443,391 = 443,391/x
3. Step 3: Cross multiply
   289,848x = 443,391 × 443,391
4. Step 4: Simplify right side
   289,848x = 196,595,578,881
5. Step 5: Solve for x
   x = 196,595,578,881/289,848
6. Step 6: Final answer
   x = 678,271.30