Finding the Fourth Proportional to 2,578.60, 3,870.06 and 1,965.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.60 : 3,870.06 = 1,965.16 : x
2. Step 2: Convert to fraction form
   2,578.60/3,870.06 = 1,965.16/x
3. Step 3: Cross multiply
   2,578.60x = 3,870.06 × 1,965.16
4. Step 4: Simplify right side
   2,578.60x = 7,605,287.11
5. Step 5: Solve for x
   x = 7,605,287.11/2,578.60
6. Step 6: Final answer
   x = 2,949.39