Finding the Fourth Proportional to 2,215.89, 3,323.61 and 572.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.89 : 3,323.61 = 572.49 : x
2. Step 2: Convert to fraction form
   2,215.89/3,323.61 = 572.49/x
3. Step 3: Cross multiply
   2,215.89x = 3,323.61 × 572.49
4. Step 4: Simplify right side
   2,215.89x = 1,902,733.49
5. Step 5: Solve for x
   x = 1,902,733.49/2,215.89
6. Step 6: Final answer
   x = 858.68