Finding the Third Proportional to 443,205 and 728,142.75

Step by Step Solution

1. Step 1: Write the proportion equation
   443,205 : 728,142.75 = 728,142.75 : x
2. Step 2: Convert to fraction form
   443,205/728,142.75 = 728,142.75/x
3. Step 3: Cross multiply
   443,205x = 728,142.75 × 728,142.75
4. Step 4: Simplify right side
   443,205x = 530,191,864,377.56
5. Step 5: Solve for x
   x = 530,191,864,377.56/443,205
6. Step 6: Final answer
   x = 1,196,267.79