Finding the Third Proportional to 139,722 and 221,398.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,722 : 221,398.50 = 221,398.50 : x
2. Step 2: Convert to fraction form
   139,722/221,398.50 = 221,398.50/x
3. Step 3: Cross multiply
   139,722x = 221,398.50 × 221,398.50
4. Step 4: Simplify right side
   139,722x = 49,017,295,802.25
5. Step 5: Solve for x
   x = 49,017,295,802.25/139,722
6. Step 6: Final answer
   x = 350,820.17