Finding the Third Proportional to 319,914 and 486,778.50

Step by Step Solution

1. Step 1: Write the proportion equation
   319,914 : 486,778.50 = 486,778.50 : x
2. Step 2: Convert to fraction form
   319,914/486,778.50 = 486,778.50/x
3. Step 3: Cross multiply
   319,914x = 486,778.50 × 486,778.50
4. Step 4: Simplify right side
   319,914x = 236,953,308,062.25
5. Step 5: Solve for x
   x = 236,953,308,062.25/319,914
6. Step 6: Final answer
   x = 740,678.14