Finding the Third Proportional to 288,634 and 429,872

Step by Step Solution

1. Step 1: Write the proportion equation
   288,634 : 429,872 = 429,872 : x
2. Step 2: Convert to fraction form
   288,634/429,872 = 429,872/x
3. Step 3: Cross multiply
   288,634x = 429,872 × 429,872
4. Step 4: Simplify right side
   288,634x = 184,789,936,384
5. Step 5: Solve for x
   x = 184,789,936,384/288,634
6. Step 6: Final answer
   x = 640,222.35