Finding the Fourth Proportional to 2,213.79, 3,320.57 and 570.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,213.79 : 3,320.57 = 570.42 : x
2. Step 2: Convert to fraction form
   2,213.79/3,320.57 = 570.42/x
3. Step 3: Cross multiply
   2,213.79x = 3,320.57 × 570.42
4. Step 4: Simplify right side
   2,213.79x = 1,894,116.69
5. Step 5: Solve for x
   x = 1,894,116.69/2,213.79
6. Step 6: Final answer
   x = 855.60