Finding the Third Proportional to 309,105 and 656,118

Step by Step Solution

1. Step 1: Write the proportion equation
   309,105 : 656,118 = 656,118 : x
2. Step 2: Convert to fraction form
   309,105/656,118 = 656,118/x
3. Step 3: Cross multiply
   309,105x = 656,118 × 656,118
4. Step 4: Simplify right side
   309,105x = 430,490,829,924
5. Step 5: Solve for x
   x = 430,490,829,924/309,105
6. Step 6: Final answer
   x = 1,392,700.96