Finding the Fourth Proportional to 2,213.61, 3,320.59 and 570.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,213.61 : 3,320.59 = 570.15 : x
2. Step 2: Convert to fraction form
   2,213.61/3,320.59 = 570.15/x
3. Step 3: Cross multiply
   2,213.61x = 3,320.59 × 570.15
4. Step 4: Simplify right side
   2,213.61x = 1,893,234.39
5. Step 5: Solve for x
   x = 1,893,234.39/2,213.61
6. Step 6: Final answer
   x = 855.27