Finding the Fourth Proportional to 2,919.20, 4,375.36 and 2,886.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,919.20 : 4,375.36 = 2,886.72 : x
2. Step 2: Convert to fraction form
   2,919.20/4,375.36 = 2,886.72/x
3. Step 3: Cross multiply
   2,919.20x = 4,375.36 × 2,886.72
4. Step 4: Simplify right side
   2,919.20x = 12,630,439.22
5. Step 5: Solve for x
   x = 12,630,439.22/2,919.20
6. Step 6: Final answer
   x = 4,326.68