Finding the Fourth Proportional to 5,215.02, 7,196.40 and 2,856.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,215.02 : 7,196.40 = 2,856.72 : x
2. Step 2: Convert to fraction form
   5,215.02/7,196.40 = 2,856.72/x
3. Step 3: Cross multiply
   5,215.02x = 7,196.40 × 2,856.72
4. Step 4: Simplify right side
   5,215.02x = 20,558,099.81
5. Step 5: Solve for x
   x = 20,558,099.81/5,215.02
6. Step 6: Final answer
   x = 3,942.09