Finding the Fourth Proportional to 3,686.52, 5,087.16 and 2,115.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,686.52 : 5,087.16 = 2,115.12 : x
2. Step 2: Convert to fraction form
   3,686.52/5,087.16 = 2,115.12/x
3. Step 3: Cross multiply
   3,686.52x = 5,087.16 × 2,115.12
4. Step 4: Simplify right side
   3,686.52x = 10,759,953.86
5. Step 5: Solve for x
   x = 10,759,953.86/3,686.52
6. Step 6: Final answer
   x = 2,918.73