Finding the Third Proportional to 312,646.50 and 659,745

Step by Step Solution

1. Step 1: Write the proportion equation
   312,646.50 : 659,745 = 659,745 : x
2. Step 2: Convert to fraction form
   312,646.50/659,745 = 659,745/x
3. Step 3: Cross multiply
   312,646.50x = 659,745 × 659,745
4. Step 4: Simplify right side
   312,646.50x = 435,263,465,025
5. Step 5: Solve for x
   x = 435,263,465,025/312,646.50
6. Step 6: Final answer
   x = 1,392,190.43