Finding the Third Proportional to 478,608 and 697,140

Step by Step Solution

1. Step 1: Write the proportion equation
   478,608 : 697,140 = 697,140 : x
2. Step 2: Convert to fraction form
   478,608/697,140 = 697,140/x
3. Step 3: Cross multiply
   478,608x = 697,140 × 697,140
4. Step 4: Simplify right side
   478,608x = 486,004,179,600
5. Step 5: Solve for x
   x = 486,004,179,600/478,608
6. Step 6: Final answer
   x = 1,015,453.52