Finding the Third Proportional to 139,406 and 221,543

Step by Step Solution

1. Step 1: Write the proportion equation
   139,406 : 221,543 = 221,543 : x
2. Step 2: Convert to fraction form
   139,406/221,543 = 221,543/x
3. Step 3: Cross multiply
   139,406x = 221,543 × 221,543
4. Step 4: Simplify right side
   139,406x = 49,081,300,849
5. Step 5: Solve for x
   x = 49,081,300,849/139,406
6. Step 6: Final answer
   x = 352,074.52