Finding the Fourth Proportional to 3,686.78, 5,087.55 and 2,114.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,686.78 : 5,087.55 = 2,114.88 : x
2. Step 2: Convert to fraction form
   3,686.78/5,087.55 = 2,114.88/x
3. Step 3: Cross multiply
   3,686.78x = 5,087.55 × 2,114.88
4. Step 4: Simplify right side
   3,686.78x = 10,759,546.60
5. Step 5: Solve for x
   x = 10,759,546.60/3,686.78
6. Step 6: Final answer
   x = 2,918.41