Finding the Third Proportional to 640,124 and 1,379,392

Step by Step Solution

1. Step 1: Write the proportion equation
   640,124 : 1,379,392 = 1,379,392 : x
2. Step 2: Convert to fraction form
   640,124/1,379,392 = 1,379,392/x
3. Step 3: Cross multiply
   640,124x = 1,379,392 × 1,379,392
4. Step 4: Simplify right side
   640,124x = 1,902,722,289,664
5. Step 5: Solve for x
   x = 1,902,722,289,664/640,124
6. Step 6: Final answer
   x = 2,972,427.67