Finding the Third Proportional to 142,012 and 309,080

Step by Step Solution

1. Step 1: Write the proportion equation
   142,012 : 309,080 = 309,080 : x
2. Step 2: Convert to fraction form
   142,012/309,080 = 309,080/x
3. Step 3: Cross multiply
   142,012x = 309,080 × 309,080
4. Step 4: Simplify right side
   142,012x = 95,530,446,400
5. Step 5: Solve for x
   x = 95,530,446,400/142,012
6. Step 6: Final answer
   x = 672,692.78