Finding the Third Proportional to 306,778.50 and 657,270

Step by Step Solution

1. Step 1: Write the proportion equation
   306,778.50 : 657,270 = 657,270 : x
2. Step 2: Convert to fraction form
   306,778.50/657,270 = 657,270/x
3. Step 3: Cross multiply
   306,778.50x = 657,270 × 657,270
4. Step 4: Simplify right side
   306,778.50x = 432,003,852,900
5. Step 5: Solve for x
   x = 432,003,852,900/306,778.50
6. Step 6: Final answer
   x = 1,408,194.68