Finding the Third Proportional to 200,286 and 309,260

Step by Step Solution

1. Step 1: Write the proportion equation
   200,286 : 309,260 = 309,260 : x
2. Step 2: Convert to fraction form
   200,286/309,260 = 309,260/x
3. Step 3: Cross multiply
   200,286x = 309,260 × 309,260
4. Step 4: Simplify right side
   200,286x = 95,641,747,600
5. Step 5: Solve for x
   x = 95,641,747,600/200,286
6. Step 6: Final answer
   x = 477,525.88