Finding the Third Proportional to 309,112 and 659,051

Step by Step Solution

1. Step 1: Write the proportion equation
   309,112 : 659,051 = 659,051 : x
2. Step 2: Convert to fraction form
   309,112/659,051 = 659,051/x
3. Step 3: Cross multiply
   309,112x = 659,051 × 659,051
4. Step 4: Simplify right side
   309,112x = 434,348,220,601
5. Step 5: Solve for x
   x = 434,348,220,601/309,112
6. Step 6: Final answer
   x = 1,405,148.36