Finding the Third Proportional to 309,137.75 and 671,150

Step by Step Solution

1. Step 1: Write the proportion equation
   309,137.75 : 671,150 = 671,150 : x
2. Step 2: Convert to fraction form
   309,137.75/671,150 = 671,150/x
3. Step 3: Cross multiply
   309,137.75x = 671,150 × 671,150
4. Step 4: Simplify right side
   309,137.75x = 450,442,322,500
5. Step 5: Solve for x
   x = 450,442,322,500/309,137.75
6. Step 6: Final answer
   x = 1,457,092.58