Finding the Third Proportional to 288,647 and 429,892

Step by Step Solution

1. Step 1: Write the proportion equation
   288,647 : 429,892 = 429,892 : x
2. Step 2: Convert to fraction form
   288,647/429,892 = 429,892/x
3. Step 3: Cross multiply
   288,647x = 429,892 × 429,892
4. Step 4: Simplify right side
   288,647x = 184,807,131,664
5. Step 5: Solve for x
   x = 184,807,131,664/288,647
6. Step 6: Final answer
   x = 640,253.08