Finding the Fourth Proportional to 2,619.88, 3,928.81 and 1,158.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,619.88 : 3,928.81 = 1,158.23 : x
2. Step 2: Convert to fraction form
   2,619.88/3,928.81 = 1,158.23/x
3. Step 3: Cross multiply
   2,619.88x = 3,928.81 × 1,158.23
4. Step 4: Simplify right side
   2,619.88x = 4,550,465.61
5. Step 5: Solve for x
   x = 4,550,465.61/2,619.88
6. Step 6: Final answer
   x = 1,736.90