Finding the Third Proportional to 478,488 and 696,978

Step by Step Solution

1. Step 1: Write the proportion equation
   478,488 : 696,978 = 696,978 : x
2. Step 2: Convert to fraction form
   478,488/696,978 = 696,978/x
3. Step 3: Cross multiply
   478,488x = 696,978 × 696,978
4. Step 4: Simplify right side
   478,488x = 485,778,332,484
5. Step 5: Solve for x
   x = 485,778,332,484/478,488
6. Step 6: Final answer
   x = 1,015,236.19