Finding the Third Proportional to 199,605 and 309,919.50

Step by Step Solution

1. Step 1: Write the proportion equation
   199,605 : 309,919.50 = 309,919.50 : x
2. Step 2: Convert to fraction form
   199,605/309,919.50 = 309,919.50/x
3. Step 3: Cross multiply
   199,605x = 309,919.50 × 309,919.50
4. Step 4: Simplify right side
   199,605x = 96,050,096,480.25
5. Step 5: Solve for x
   x = 96,050,096,480.25/199,605
6. Step 6: Final answer
   x = 481,200.85