Finding the Third Proportional to 89,709 and 188,711

Step by Step Solution

1. Step 1: Write the proportion equation
   89,709 : 188,711 = 188,711 : x
2. Step 2: Convert to fraction form
   89,709/188,711 = 188,711/x
3. Step 3: Cross multiply
   89,709x = 188,711 × 188,711
4. Step 4: Simplify right side
   89,709x = 35,611,841,521
5. Step 5: Solve for x
   x = 35,611,841,521/89,709
6. Step 6: Final answer
   x = 396,970.67