Finding the Third Proportional to 306,918 and 674,745.75

Step by Step Solution

1. Step 1: Write the proportion equation
   306,918 : 674,745.75 = 674,745.75 : x
2. Step 2: Convert to fraction form
   306,918/674,745.75 = 674,745.75/x
3. Step 3: Cross multiply
   306,918x = 674,745.75 × 674,745.75
4. Step 4: Simplify right side
   306,918x = 455,281,827,143.06
5. Step 5: Solve for x
   x = 455,281,827,143.06/306,918
6. Step 6: Final answer
   x = 1,483,398.91