Finding the Third Proportional to 213,672 and 309,484

Step by Step Solution

1. Step 1: Write the proportion equation
   213,672 : 309,484 = 309,484 : x
2. Step 2: Convert to fraction form
   213,672/309,484 = 309,484/x
3. Step 3: Cross multiply
   213,672x = 309,484 × 309,484
4. Step 4: Simplify right side
   213,672x = 95,780,346,256
5. Step 5: Solve for x
   x = 95,780,346,256/213,672
6. Step 6: Final answer
   x = 448,258.76