Finding the Third Proportional to 199,599 and 309,910.50

Step by Step Solution

1. Step 1: Write the proportion equation
   199,599 : 309,910.50 = 309,910.50 : x
2. Step 2: Convert to fraction form
   199,599/309,910.50 = 309,910.50/x
3. Step 3: Cross multiply
   199,599x = 309,910.50 × 309,910.50
4. Step 4: Simplify right side
   199,599x = 96,044,518,010.25
5. Step 5: Solve for x
   x = 96,044,518,010.25/199,599
6. Step 6: Final answer
   x = 481,187.37