Finding the Third Proportional to 687,928 and 1,042,280

Step by Step Solution

1. Step 1: Write the proportion equation
   687,928 : 1,042,280 = 1,042,280 : x
2. Step 2: Convert to fraction form
   687,928/1,042,280 = 1,042,280/x
3. Step 3: Cross multiply
   687,928x = 1,042,280 × 1,042,280
4. Step 4: Simplify right side
   687,928x = 1,086,347,598,400
5. Step 5: Solve for x
   x = 1,086,347,598,400/687,928
6. Step 6: Final answer
   x = 1,579,158.86