Finding the Third Proportional to 438,876 and 655,443

Step by Step Solution

1. Step 1: Write the proportion equation
   438,876 : 655,443 = 655,443 : x
2. Step 2: Convert to fraction form
   438,876/655,443 = 655,443/x
3. Step 3: Cross multiply
   438,876x = 655,443 × 655,443
4. Step 4: Simplify right side
   438,876x = 429,605,526,249
5. Step 5: Solve for x
   x = 429,605,526,249/438,876
6. Step 6: Final answer
   x = 978,876.78