Finding the Third Proportional to 679,540 and 816,092.50

Step by Step Solution

1. Step 1: Write the proportion equation
   679,540 : 816,092.50 = 816,092.50 : x
2. Step 2: Convert to fraction form
   679,540/816,092.50 = 816,092.50/x
3. Step 3: Cross multiply
   679,540x = 816,092.50 × 816,092.50
4. Step 4: Simplify right side
   679,540x = 666,006,968,556.25
5. Step 5: Solve for x
   x = 666,006,968,556.25/679,540
6. Step 6: Final answer
   x = 980,085.01