Finding the Fourth Proportional to 2,619.29, 3,928.83 and 887.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,619.29 : 3,928.83 = 887.91 : x
2. Step 2: Convert to fraction form
   2,619.29/3,928.83 = 887.91/x
3. Step 3: Cross multiply
   2,619.29x = 3,928.83 × 887.91
4. Step 4: Simplify right side
   2,619.29x = 3,488,447.45
5. Step 5: Solve for x
   x = 3,488,447.45/2,619.29
6. Step 6: Final answer
   x = 1,331.83