Finding the Third Proportional to 634,716 and 870,345

Step by Step Solution

1. Step 1: Write the proportion equation
   634,716 : 870,345 = 870,345 : x
2. Step 2: Convert to fraction form
   634,716/870,345 = 870,345/x
3. Step 3: Cross multiply
   634,716x = 870,345 × 870,345
4. Step 4: Simplify right side
   634,716x = 757,500,419,025
5. Step 5: Solve for x
   x = 757,500,419,025/634,716
6. Step 6: Final answer
   x = 1,193,447.81