Finding the Third Proportional to 139,717 and 221,332.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,717 : 221,332.50 = 221,332.50 : x
2. Step 2: Convert to fraction form
   139,717/221,332.50 = 221,332.50/x
3. Step 3: Cross multiply
   139,717x = 221,332.50 × 221,332.50
4. Step 4: Simplify right side
   139,717x = 48,988,075,556.25
5. Step 5: Solve for x
   x = 48,988,075,556.25/139,717
6. Step 6: Final answer
   x = 350,623.59