Finding the Fourth Proportional to 3,978.69, 5,489.22 and 2,486.08

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.69 : 5,489.22 = 2,486.08 : x
2. Step 2: Convert to fraction form
   3,978.69/5,489.22 = 2,486.08/x
3. Step 3: Cross multiply
   3,978.69x = 5,489.22 × 2,486.08
4. Step 4: Simplify right side
   3,978.69x = 13,646,640.06
5. Step 5: Solve for x
   x = 13,646,640.06/3,978.69
6. Step 6: Final answer
   x = 3,429.93