Finding the Third Proportional to 213,770 and 470,428

Step by Step Solution

1. Step 1: Write the proportion equation
   213,770 : 470,428 = 470,428 : x
2. Step 2: Convert to fraction form
   213,770/470,428 = 470,428/x
3. Step 3: Cross multiply
   213,770x = 470,428 × 470,428
4. Step 4: Simplify right side
   213,770x = 221,302,503,184
5. Step 5: Solve for x
   x = 221,302,503,184/213,770
6. Step 6: Final answer
   x = 1,035,236.48