Finding the Third Proportional to 681,493.50 and 990,504

Step by Step Solution

1. Step 1: Write the proportion equation
   681,493.50 : 990,504 = 990,504 : x
2. Step 2: Convert to fraction form
   681,493.50/990,504 = 990,504/x
3. Step 3: Cross multiply
   681,493.50x = 990,504 × 990,504
4. Step 4: Simplify right side
   681,493.50x = 981,098,174,016
5. Step 5: Solve for x
   x = 981,098,174,016/681,493.50
6. Step 6: Final answer
   x = 1,439,629.54