Finding the Third Proportional to 141,270.75 and 309,109.50

Step by Step Solution

1. Step 1: Write the proportion equation
   141,270.75 : 309,109.50 = 309,109.50 : x
2. Step 2: Convert to fraction form
   141,270.75/309,109.50 = 309,109.50/x
3. Step 3: Cross multiply
   141,270.75x = 309,109.50 × 309,109.50
4. Step 4: Simplify right side
   141,270.75x = 95,548,682,990.25
5. Step 5: Solve for x
   x = 95,548,682,990.25/141,270.75
6. Step 6: Final answer
   x = 676,351.50