Finding the Fourth Proportional to 2,636.40, 3,949.52 and 1,478.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,636.40 : 3,949.52 = 1,478.64 : x
2. Step 2: Convert to fraction form
   2,636.40/3,949.52 = 1,478.64/x
3. Step 3: Cross multiply
   2,636.40x = 3,949.52 × 1,478.64
4. Step 4: Simplify right side
   2,636.40x = 5,839,918.25
5. Step 5: Solve for x
   x = 5,839,918.25/2,636.40
6. Step 6: Final answer
   x = 2,215.11