Finding the Third Proportional to 638,751 and 1,390,902

Step by Step Solution

1. Step 1: Write the proportion equation
   638,751 : 1,390,902 = 1,390,902 : x
2. Step 2: Convert to fraction form
   638,751/1,390,902 = 1,390,902/x
3. Step 3: Cross multiply
   638,751x = 1,390,902 × 1,390,902
4. Step 4: Simplify right side
   638,751x = 1,934,608,373,604
5. Step 5: Solve for x
   x = 1,934,608,373,604/638,751
6. Step 6: Final answer
   x = 3,028,736.35