Finding the Third Proportional to 149,899 and 319,218.50

Step by Step Solution

1. Step 1: Write the proportion equation
   149,899 : 319,218.50 = 319,218.50 : x
2. Step 2: Convert to fraction form
   149,899/319,218.50 = 319,218.50/x
3. Step 3: Cross multiply
   149,899x = 319,218.50 × 319,218.50
4. Step 4: Simplify right side
   149,899x = 101,900,450,742.25
5. Step 5: Solve for x
   x = 101,900,450,742.25/149,899
6. Step 6: Final answer
   x = 679,794.07