Finding the Third Proportional to 578,980 and 1,256,988

Step by Step Solution

1. Step 1: Write the proportion equation
   578,980 : 1,256,988 = 1,256,988 : x
2. Step 2: Convert to fraction form
   578,980/1,256,988 = 1,256,988/x
3. Step 3: Cross multiply
   578,980x = 1,256,988 × 1,256,988
4. Step 4: Simplify right side
   578,980x = 1,580,018,832,144
5. Step 5: Solve for x
   x = 1,580,018,832,144/578,980
6. Step 6: Final answer
   x = 2,728,969.62