Finding the Fourth Proportional to 2,639.04, 3,954.72 and 1,478.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.04 : 3,954.72 = 1,478.88 : x
2. Step 2: Convert to fraction form
   2,639.04/3,954.72 = 1,478.88/x
3. Step 3: Cross multiply
   2,639.04x = 3,954.72 × 1,478.88
4. Step 4: Simplify right side
   2,639.04x = 5,848,556.31
5. Step 5: Solve for x
   x = 5,848,556.31/2,639.04
6. Step 6: Final answer
   x = 2,216.17