Finding the Fourth Proportional to 7,015.20, 9,680.88 and 3,871.18

Step by Step Solution

1. Step 1: Write the proportion equation
   7,015.20 : 9,680.88 = 3,871.18 : x
2. Step 2: Convert to fraction form
   7,015.20/9,680.88 = 3,871.18/x
3. Step 3: Cross multiply
   7,015.20x = 9,680.88 × 3,871.18
4. Step 4: Simplify right side
   7,015.20x = 37,476,429.04
5. Step 5: Solve for x
   x = 37,476,429.04/7,015.20
6. Step 6: Final answer
   x = 5,342.18