Finding the Third Proportional to 1,038,978 and 1,407,939

Step by Step Solution

1. Step 1: Write the proportion equation
   1,038,978 : 1,407,939 = 1,407,939 : x
2. Step 2: Convert to fraction form
   1,038,978/1,407,939 = 1,407,939/x
3. Step 3: Cross multiply
   1,038,978x = 1,407,939 × 1,407,939
4. Step 4: Simplify right side
   1,038,978x = 1,982,292,227,721
5. Step 5: Solve for x
   x = 1,982,292,227,721/1,038,978
6. Step 6: Final answer
   x = 1,907,925.12