Finding the Fourth Proportional to 5,228.42, 7,215.25 and 2,870.58

Step by Step Solution

1. Step 1: Write the proportion equation
   5,228.42 : 7,215.25 = 2,870.58 : x
2. Step 2: Convert to fraction form
   5,228.42/7,215.25 = 2,870.58/x
3. Step 3: Cross multiply
   5,228.42x = 7,215.25 × 2,870.58
4. Step 4: Simplify right side
   5,228.42x = 20,711,952.35
5. Step 5: Solve for x
   x = 20,711,952.35/5,228.42
6. Step 6: Final answer
   x = 3,961.42