Finding the Fourth Proportional to 5,228.68, 7,215.59 and 2,870.83

Step by Step Solution

1. Step 1: Write the proportion equation
   5,228.68 : 7,215.59 = 2,870.83 : x
2. Step 2: Convert to fraction form
   5,228.68/7,215.59 = 2,870.83/x
3. Step 3: Cross multiply
   5,228.68x = 7,215.59 × 2,870.83
4. Step 4: Simplify right side
   5,228.68x = 20,714,732.24
5. Step 5: Solve for x
   x = 20,714,732.24/5,228.68
6. Step 6: Final answer
   x = 3,961.75