Finding the Third Proportional to 302,731.50 and 648,928.50

Step by Step Solution

1. Step 1: Write the proportion equation
   302,731.50 : 648,928.50 = 648,928.50 : x
2. Step 2: Convert to fraction form
   302,731.50/648,928.50 = 648,928.50/x
3. Step 3: Cross multiply
   302,731.50x = 648,928.50 × 648,928.50
4. Step 4: Simplify right side
   302,731.50x = 421,108,198,112.25
5. Step 5: Solve for x
   x = 421,108,198,112.25/302,731.50
6. Step 6: Final answer
   x = 1,391,028.68