Finding the Third Proportional to 309,158 and 491,790

Step by Step Solution

1. Step 1: Write the proportion equation
   309,158 : 491,790 = 491,790 : x
2. Step 2: Convert to fraction form
   309,158/491,790 = 491,790/x
3. Step 3: Cross multiply
   309,158x = 491,790 × 491,790
4. Step 4: Simplify right side
   309,158x = 241,857,404,100
5. Step 5: Solve for x
   x = 241,857,404,100/309,158
6. Step 6: Final answer
   x = 782,310.03