Finding the Fourth Proportional to 3,687.12, 5,087.52 and 2,115.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3,687.12 : 5,087.52 = 2,115.18 : x
2. Step 2: Convert to fraction form
   3,687.12/5,087.52 = 2,115.18/x
3. Step 3: Cross multiply
   3,687.12x = 5,087.52 × 2,115.18
4. Step 4: Simplify right side
   3,687.12x = 10,761,020.55
5. Step 5: Solve for x
   x = 10,761,020.55/3,687.12
6. Step 6: Final answer
   x = 2,918.54