Finding the Fourth Proportional to 2,215.38, 3,322.72 and 571.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.38 : 3,322.72 = 571.87 : x
2. Step 2: Convert to fraction form
   2,215.38/3,322.72 = 571.87/x
3. Step 3: Cross multiply
   2,215.38x = 3,322.72 × 571.87
4. Step 4: Simplify right side
   2,215.38x = 1,900,154.15
5. Step 5: Solve for x
   x = 1,900,154.15/2,215.38
6. Step 6: Final answer
   x = 857.71