Finding the Third Proportional to 319,860 and 679,081.50

Step by Step Solution

1. Step 1: Write the proportion equation
   319,860 : 679,081.50 = 679,081.50 : x
2. Step 2: Convert to fraction form
   319,860/679,081.50 = 679,081.50/x
3. Step 3: Cross multiply
   319,860x = 679,081.50 × 679,081.50
4. Step 4: Simplify right side
   319,860x = 461,151,683,642.25
5. Step 5: Solve for x
   x = 461,151,683,642.25/319,860
6. Step 6: Final answer
   x = 1,441,729.77