Finding the Third Proportional to 213,672 and 309,492

Step by Step Solution

1. Step 1: Write the proportion equation
   213,672 : 309,492 = 309,492 : x
2. Step 2: Convert to fraction form
   213,672/309,492 = 309,492/x
3. Step 3: Cross multiply
   213,672x = 309,492 × 309,492
4. Step 4: Simplify right side
   213,672x = 95,785,298,064
5. Step 5: Solve for x
   x = 95,785,298,064/213,672
6. Step 6: Final answer
   x = 448,281.94