Finding the Third Proportional to 678,798 and 1,006,455

Step by Step Solution

1. Step 1: Write the proportion equation
   678,798 : 1,006,455 = 1,006,455 : x
2. Step 2: Convert to fraction form
   678,798/1,006,455 = 1,006,455/x
3. Step 3: Cross multiply
   678,798x = 1,006,455 × 1,006,455
4. Step 4: Simplify right side
   678,798x = 1,012,951,667,025
5. Step 5: Solve for x
   x = 1,012,951,667,025/678,798
6. Step 6: Final answer
   x = 1,492,272.62