Finding the Fourth Proportional to 2,639.39, 3,959.33 and 1,079.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.39 : 3,959.33 = 1,079.51 : x
2. Step 2: Convert to fraction form
   2,639.39/3,959.33 = 1,079.51/x
3. Step 3: Cross multiply
   2,639.39x = 3,959.33 × 1,079.51
4. Step 4: Simplify right side
   2,639.39x = 4,274,111.13
5. Step 5: Solve for x
   x = 4,274,111.13/2,639.39
6. Step 6: Final answer
   x = 1,619.36