Finding the Fourth Proportional to 2,660,478.30, 3,990,717.45 and 978,788.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,660,478.30 : 3,990,717.45 = 978,788.70 : x
2. Step 2: Convert to fraction form
   2,660,478.30/3,990,717.45 = 978,788.70/x
3. Step 3: Cross multiply
   2,660,478.30x = 3,990,717.45 × 978,788.70
4. Step 4: Simplify right side
   2,660,478.30x = 3,906,069,144,952.82
5. Step 5: Solve for x
   x = 3,906,069,144,952.82/2,660,478.30
6. Step 6: Final answer
   x = 1,468,183.05