Finding the Third Proportional to 671,664 and 1,419,139

Step by Step Solution

1. Step 1: Write the proportion equation
   671,664 : 1,419,139 = 1,419,139 : x
2. Step 2: Convert to fraction form
   671,664/1,419,139 = 1,419,139/x
3. Step 3: Cross multiply
   671,664x = 1,419,139 × 1,419,139
4. Step 4: Simplify right side
   671,664x = 2,013,955,501,321
5. Step 5: Solve for x
   x = 2,013,955,501,321/671,664
6. Step 6: Final answer
   x = 2,998,456.82