Finding the Third Proportional to 287,799 and 617,886

Step by Step Solution

1. Step 1: Write the proportion equation
   287,799 : 617,886 = 617,886 : x
2. Step 2: Convert to fraction form
   287,799/617,886 = 617,886/x
3. Step 3: Cross multiply
   287,799x = 617,886 × 617,886
4. Step 4: Simplify right side
   287,799x = 381,783,108,996
5. Step 5: Solve for x
   x = 381,783,108,996/287,799
6. Step 6: Final answer
   x = 1,326,561.62