Finding the Third Proportional to 578,978 and 1,256,984

Step by Step Solution

1. Step 1: Write the proportion equation
   578,978 : 1,256,984 = 1,256,984 : x
2. Step 2: Convert to fraction form
   578,978/1,256,984 = 1,256,984/x
3. Step 3: Cross multiply
   578,978x = 1,256,984 × 1,256,984
4. Step 4: Simplify right side
   578,978x = 1,580,008,776,256
5. Step 5: Solve for x
   x = 1,580,008,776,256/578,978
6. Step 6: Final answer
   x = 2,728,961.68