Finding the Fourth Proportional to 5,215.15, 7,196.91 and 2,857.29

Step by Step Solution

1. Step 1: Write the proportion equation
   5,215.15 : 7,196.91 = 2,857.29 : x
2. Step 2: Convert to fraction form
   5,215.15/7,196.91 = 2,857.29/x
3. Step 3: Cross multiply
   5,215.15x = 7,196.91 × 2,857.29
4. Step 4: Simplify right side
   5,215.15x = 20,563,677.83
5. Step 5: Solve for x
   x = 20,563,677.83/5,215.15
6. Step 6: Final answer
   x = 3,943.06