Finding the Third Proportional to 90,769.50 and 209,790

Step by Step Solution

1. Step 1: Write the proportion equation
   90,769.50 : 209,790 = 209,790 : x
2. Step 2: Convert to fraction form
   90,769.50/209,790 = 209,790/x
3. Step 3: Cross multiply
   90,769.50x = 209,790 × 209,790
4. Step 4: Simplify right side
   90,769.50x = 44,011,844,100
5. Step 5: Solve for x
   x = 44,011,844,100/90,769.50
6. Step 6: Final answer
   x = 484,874.81