Finding the Third Proportional to 139,414 and 305,510

Step by Step Solution

1. Step 1: Write the proportion equation
   139,414 : 305,510 = 305,510 : x
2. Step 2: Convert to fraction form
   139,414/305,510 = 305,510/x
3. Step 3: Cross multiply
   139,414x = 305,510 × 305,510
4. Step 4: Simplify right side
   139,414x = 93,336,360,100
5. Step 5: Solve for x
   x = 93,336,360,100/139,414
6. Step 6: Final answer
   x = 669,490.58