Finding the Third Proportional to 312,649.50 and 659,751

Step by Step Solution

1. Step 1: Write the proportion equation
   312,649.50 : 659,751 = 659,751 : x
2. Step 2: Convert to fraction form
   312,649.50/659,751 = 659,751/x
3. Step 3: Cross multiply
   312,649.50x = 659,751 × 659,751
4. Step 4: Simplify right side
   312,649.50x = 435,271,382,001
5. Step 5: Solve for x
   x = 435,271,382,001/312,649.50
6. Step 6: Final answer
   x = 1,392,202.39