Finding the Fourth Proportional to 5,228.67, 7,215.20 and 2,870.37

Step by Step Solution

1. Step 1: Write the proportion equation
   5,228.67 : 7,215.20 = 2,870.37 : x
2. Step 2: Convert to fraction form
   5,228.67/7,215.20 = 2,870.37/x
3. Step 3: Cross multiply
   5,228.67x = 7,215.20 × 2,870.37
4. Step 4: Simplify right side
   5,228.67x = 20,710,279.27
5. Step 5: Solve for x
   x = 20,710,279.27/5,228.67
6. Step 6: Final answer
   x = 3,960.91