Finding the Third Proportional to 318,618 and 488,983.50

Step by Step Solution

1. Step 1: Write the proportion equation
   318,618 : 488,983.50 = 488,983.50 : x
2. Step 2: Convert to fraction form
   318,618/488,983.50 = 488,983.50/x
3. Step 3: Cross multiply
   318,618x = 488,983.50 × 488,983.50
4. Step 4: Simplify right side
   318,618x = 239,104,863,272.25
5. Step 5: Solve for x
   x = 239,104,863,272.25/318,618
6. Step 6: Final answer
   x = 750,443.68