Finding the Fourth Proportional to 2,830.68, 4,238.33 and 2,215.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,830.68 : 4,238.33 = 2,215.49 : x
2. Step 2: Convert to fraction form
   2,830.68/4,238.33 = 2,215.49/x
3. Step 3: Cross multiply
   2,830.68x = 4,238.33 × 2,215.49
4. Step 4: Simplify right side
   2,830.68x = 9,389,945.46
5. Step 5: Solve for x
   x = 9,389,945.46/2,830.68
6. Step 6: Final answer
   x = 3,317.20