Finding the Third Proportional to 424,399.50 and 636,599.25

Step by Step Solution

1. Step 1: Write the proportion equation
   424,399.50 : 636,599.25 = 636,599.25 : x
2. Step 2: Convert to fraction form
   424,399.50/636,599.25 = 636,599.25/x
3. Step 3: Cross multiply
   424,399.50x = 636,599.25 × 636,599.25
4. Step 4: Simplify right side
   424,399.50x = 405,258,605,100.56
5. Step 5: Solve for x
   x = 405,258,605,100.56/424,399.50
6. Step 6: Final answer
   x = 954,898.88