Finding the Fourth Proportional to 2,619.06, 3,928.56 and 671.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,619.06 : 3,928.56 = 671.23 : x
2. Step 2: Convert to fraction form
   2,619.06/3,928.56 = 671.23/x
3. Step 3: Cross multiply
   2,619.06x = 3,928.56 × 671.23
4. Step 4: Simplify right side
   2,619.06x = 2,636,967.33
5. Step 5: Solve for x
   x = 2,636,967.33/2,619.06
6. Step 6: Final answer
   x = 1,006.84