Finding the Third Proportional to 139,758 and 221,409

Step by Step Solution

1. Step 1: Write the proportion equation
   139,758 : 221,409 = 221,409 : x
2. Step 2: Convert to fraction form
   139,758/221,409 = 221,409/x
3. Step 3: Cross multiply
   139,758x = 221,409 × 221,409
4. Step 4: Simplify right side
   139,758x = 49,021,945,281
5. Step 5: Solve for x
   x = 49,021,945,281/139,758
6. Step 6: Final answer
   x = 350,763.07