Finding the Third Proportional to 400,443 and 619,836

Step by Step Solution

1. Step 1: Write the proportion equation
   400,443 : 619,836 = 619,836 : x
2. Step 2: Convert to fraction form
   400,443/619,836 = 619,836/x
3. Step 3: Cross multiply
   400,443x = 619,836 × 619,836
4. Step 4: Simplify right side
   400,443x = 384,196,666,896
5. Step 5: Solve for x
   x = 384,196,666,896/400,443
6. Step 6: Final answer
   x = 959,429.10