Finding the Third Proportional to 139,697 and 221,300

Step by Step Solution

1. Step 1: Write the proportion equation
   139,697 : 221,300 = 221,300 : x
2. Step 2: Convert to fraction form
   139,697/221,300 = 221,300/x
3. Step 3: Cross multiply
   139,697x = 221,300 × 221,300
4. Step 4: Simplify right side
   139,697x = 48,973,690,000
5. Step 5: Solve for x
   x = 48,973,690,000/139,697
6. Step 6: Final answer
   x = 350,570.81