Finding the Third Proportional to 139,214 and 217,144

Step by Step Solution

1. Step 1: Write the proportion equation
   139,214 : 217,144 = 217,144 : x
2. Step 2: Convert to fraction form
   139,214/217,144 = 217,144/x
3. Step 3: Cross multiply
   139,214x = 217,144 × 217,144
4. Step 4: Simplify right side
   139,214x = 47,151,516,736
5. Step 5: Solve for x
   x = 47,151,516,736/139,214
6. Step 6: Final answer
   x = 338,698.10