Finding the Third Proportional to 405,600.75 and 636,243

Step by Step Solution

1. Step 1: Write the proportion equation
   405,600.75 : 636,243 = 636,243 : x
2. Step 2: Convert to fraction form
   405,600.75/636,243 = 636,243/x
3. Step 3: Cross multiply
   405,600.75x = 636,243 × 636,243
4. Step 4: Simplify right side
   405,600.75x = 404,805,155,049
5. Step 5: Solve for x
   x = 404,805,155,049/405,600.75
6. Step 6: Final answer
   x = 998,038.48