Finding the Third Proportional to 128,672 and 304,144

Step by Step Solution

1. Step 1: Write the proportion equation
   128,672 : 304,144 = 304,144 : x
2. Step 2: Convert to fraction form
   128,672/304,144 = 304,144/x
3. Step 3: Cross multiply
   128,672x = 304,144 × 304,144
4. Step 4: Simplify right side
   128,672x = 92,503,572,736
5. Step 5: Solve for x
   x = 92,503,572,736/128,672
6. Step 6: Final answer
   x = 718,909.89