Finding the Third Proportional to 287,664 and 605,655.75

Step by Step Solution

1. Step 1: Write the proportion equation
   287,664 : 605,655.75 = 605,655.75 : x
2. Step 2: Convert to fraction form
   287,664/605,655.75 = 605,655.75/x
3. Step 3: Cross multiply
   287,664x = 605,655.75 × 605,655.75
4. Step 4: Simplify right side
   287,664x = 366,818,887,508.06
5. Step 5: Solve for x
   x = 366,818,887,508.06/287,664
6. Step 6: Final answer
   x = 1,275,164.38