Finding the Third Proportional to 86,438 and 188,020

Step by Step Solution

1. Step 1: Write the proportion equation
   86,438 : 188,020 = 188,020 : x
2. Step 2: Convert to fraction form
   86,438/188,020 = 188,020/x
3. Step 3: Cross multiply
   86,438x = 188,020 × 188,020
4. Step 4: Simplify right side
   86,438x = 35,351,520,400
5. Step 5: Solve for x
   x = 35,351,520,400/86,438
6. Step 6: Final answer
   x = 408,981.24