Finding the Third Proportional to 142,968 and 309,474

Step by Step Solution

1. Step 1: Write the proportion equation
   142,968 : 309,474 = 309,474 : x
2. Step 2: Convert to fraction form
   142,968/309,474 = 309,474/x
3. Step 3: Cross multiply
   142,968x = 309,474 × 309,474
4. Step 4: Simplify right side
   142,968x = 95,774,156,676
5. Step 5: Solve for x
   x = 95,774,156,676/142,968
6. Step 6: Final answer
   x = 669,899.25