Finding the Third Proportional to 140,278 and 300,253

Step by Step Solution

1. Step 1: Write the proportion equation
   140,278 : 300,253 = 300,253 : x
2. Step 2: Convert to fraction form
   140,278/300,253 = 300,253/x
3. Step 3: Cross multiply
   140,278x = 300,253 × 300,253
4. Step 4: Simplify right side
   140,278x = 90,151,864,009
5. Step 5: Solve for x
   x = 90,151,864,009/140,278
6. Step 6: Final answer
   x = 642,665.74