Finding the Fourth Proportional to 5,196.96, 7,171.80 and 2,839.28

Step by Step Solution

1. Step 1: Write the proportion equation
   5,196.96 : 7,171.80 = 2,839.28 : x
2. Step 2: Convert to fraction form
   5,196.96/7,171.80 = 2,839.28/x
3. Step 3: Cross multiply
   5,196.96x = 7,171.80 × 2,839.28
4. Step 4: Simplify right side
   5,196.96x = 20,362,748.30
5. Step 5: Solve for x
   x = 20,362,748.30/5,196.96
6. Step 6: Final answer
   x = 3,918.20