Finding the Fourth Proportional to 5,216.72, 7,199.18 and 2,858.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,216.72 : 7,199.18 = 2,858.72 : x
2. Step 2: Convert to fraction form
   5,216.72/7,199.18 = 2,858.72/x
3. Step 3: Cross multiply
   5,216.72x = 7,199.18 × 2,858.72
4. Step 4: Simplify right side
   5,216.72x = 20,580,439.85
5. Step 5: Solve for x
   x = 20,580,439.85/5,216.72
6. Step 6: Final answer
   x = 3,945.09