Finding the Fourth Proportional to 8,987.56, 13,480.38 and 3,144.28

Step by Step Solution

1. Step 1: Write the proportion equation
   8,987.56 : 13,480.38 = 3,144.28 : x
2. Step 2: Convert to fraction form
   8,987.56/13,480.38 = 3,144.28/x
3. Step 3: Cross multiply
   8,987.56x = 13,480.38 × 3,144.28
4. Step 4: Simplify right side
   8,987.56x = 42,386,089.23
5. Step 5: Solve for x
   x = 42,386,089.23/8,987.56
6. Step 6: Final answer
   x = 4,716.08