Finding the Third Proportional to 149,870 and 320,998

Step by Step Solution

1. Step 1: Write the proportion equation
   149,870 : 320,998 = 320,998 : x
2. Step 2: Convert to fraction form
   149,870/320,998 = 320,998/x
3. Step 3: Cross multiply
   149,870x = 320,998 × 320,998
4. Step 4: Simplify right side
   149,870x = 103,039,716,004
5. Step 5: Solve for x
   x = 103,039,716,004/149,870
6. Step 6: Final answer
   x = 687,527.30