Finding the Third Proportional to 434,513 and 636,216

Step by Step Solution

1. Step 1: Write the proportion equation
   434,513 : 636,216 = 636,216 : x
2. Step 2: Convert to fraction form
   434,513/636,216 = 636,216/x
3. Step 3: Cross multiply
   434,513x = 636,216 × 636,216
4. Step 4: Simplify right side
   434,513x = 404,770,798,656
5. Step 5: Solve for x
   x = 404,770,798,656/434,513
6. Step 6: Final answer
   x = 931,550.49