Finding the Third Proportional to 443,968 and 721,315

Step by Step Solution

1. Step 1: Write the proportion equation
   443,968 : 721,315 = 721,315 : x
2. Step 2: Convert to fraction form
   443,968/721,315 = 721,315/x
3. Step 3: Cross multiply
   443,968x = 721,315 × 721,315
4. Step 4: Simplify right side
   443,968x = 520,295,329,225
5. Step 5: Solve for x
   x = 520,295,329,225/443,968
6. Step 6: Final answer
   x = 1,171,920.79