Finding the Fourth Proportional to 3,987.59, 5,479.76 and 3,804.64

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987.59 : 5,479.76 = 3,804.64 : x
2. Step 2: Convert to fraction form
   3,987.59/5,479.76 = 3,804.64/x
3. Step 3: Cross multiply
   3,987.59x = 5,479.76 × 3,804.64
4. Step 4: Simplify right side
   3,987.59x = 20,848,509.90
5. Step 5: Solve for x
   x = 20,848,509.90/3,987.59
6. Step 6: Final answer
   x = 5,228.35