Finding the Third Proportional to 139,000 and 300,028

Step by Step Solution

1. Step 1: Write the proportion equation
   139,000 : 300,028 = 300,028 : x
2. Step 2: Convert to fraction form
   139,000/300,028 = 300,028/x
3. Step 3: Cross multiply
   139,000x = 300,028 × 300,028
4. Step 4: Simplify right side
   139,000x = 90,016,800,784
5. Step 5: Solve for x
   x = 90,016,800,784/139,000
6. Step 6: Final answer
   x = 647,602.88