Finding the Third Proportional to 144,891 and 315,524.81

Step by Step Solution

1. Step 1: Write the proportion equation
   144,891 : 315,524.81 = 315,524.81 : x
2. Step 2: Convert to fraction form
   144,891/315,524.81 = 315,524.81/x
3. Step 3: Cross multiply
   144,891x = 315,524.81 × 315,524.81
4. Step 4: Simplify right side
   144,891x = 99,555,907,303.16
5. Step 5: Solve for x
   x = 99,555,907,303.16/144,891
6. Step 6: Final answer
   x = 687,108.98