Finding the Third Proportional to 262,299 and 398,577.75

Step by Step Solution

1. Step 1: Write the proportion equation
   262,299 : 398,577.75 = 398,577.75 : x
2. Step 2: Convert to fraction form
   262,299/398,577.75 = 398,577.75/x
3. Step 3: Cross multiply
   262,299x = 398,577.75 × 398,577.75
4. Step 4: Simplify right side
   262,299x = 158,864,222,795.06
5. Step 5: Solve for x
   x = 158,864,222,795.06/262,299
6. Step 6: Final answer
   x = 605,660.80