Finding the Third Proportional to 90,790 and 199,496

Step by Step Solution

1. Step 1: Write the proportion equation
   90,790 : 199,496 = 199,496 : x
2. Step 2: Convert to fraction form
   90,790/199,496 = 199,496/x
3. Step 3: Cross multiply
   90,790x = 199,496 × 199,496
4. Step 4: Simplify right side
   90,790x = 39,798,654,016
5. Step 5: Solve for x
   x = 39,798,654,016/90,790
6. Step 6: Final answer
   x = 438,359.45