Finding the Third Proportional to 139,455 and 221,616

Step by Step Solution

1. Step 1: Write the proportion equation
   139,455 : 221,616 = 221,616 : x
2. Step 2: Convert to fraction form
   139,455/221,616 = 221,616/x
3. Step 3: Cross multiply
   139,455x = 221,616 × 221,616
4. Step 4: Simplify right side
   139,455x = 49,113,651,456
5. Step 5: Solve for x
   x = 49,113,651,456/139,455
6. Step 6: Final answer
   x = 352,182.79