Finding the Third Proportional to 288,648 and 429,894

Step by Step Solution

1. Step 1: Write the proportion equation
   288,648 : 429,894 = 429,894 : x
2. Step 2: Convert to fraction form
   288,648/429,894 = 429,894/x
3. Step 3: Cross multiply
   288,648x = 429,894 × 429,894
4. Step 4: Simplify right side
   288,648x = 184,808,851,236
5. Step 5: Solve for x
   x = 184,808,851,236/288,648
6. Step 6: Final answer
   x = 640,256.82