Finding the Third Proportional to 455,436 and 680,610

Step by Step Solution

1. Step 1: Write the proportion equation
   455,436 : 680,610 = 680,610 : x
2. Step 2: Convert to fraction form
   455,436/680,610 = 680,610/x
3. Step 3: Cross multiply
   455,436x = 680,610 × 680,610
4. Step 4: Simplify right side
   455,436x = 463,229,972,100
5. Step 5: Solve for x
   x = 463,229,972,100/455,436
6. Step 6: Final answer
   x = 1,017,113.21