Finding the Third Proportional to 140,388 and 300,072

Step by Step Solution

1. Step 1: Write the proportion equation
   140,388 : 300,072 = 300,072 : x
2. Step 2: Convert to fraction form
   140,388/300,072 = 300,072/x
3. Step 3: Cross multiply
   140,388x = 300,072 × 300,072
4. Step 4: Simplify right side
   140,388x = 90,043,205,184
5. Step 5: Solve for x
   x = 90,043,205,184/140,388
6. Step 6: Final answer
   x = 641,388.19