Finding the Third Proportional to 319,992 and 691,297.50

Step by Step Solution

1. Step 1: Write the proportion equation
   319,992 : 691,297.50 = 691,297.50 : x
2. Step 2: Convert to fraction form
   319,992/691,297.50 = 691,297.50/x
3. Step 3: Cross multiply
   319,992x = 691,297.50 × 691,297.50
4. Step 4: Simplify right side
   319,992x = 477,892,233,506.25
5. Step 5: Solve for x
   x = 477,892,233,506.25/319,992
6. Step 6: Final answer
   x = 1,493,450.57