Finding the Fourth Proportional to 2,860.22, 4,290.82 and 1,216.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,860.22 : 4,290.82 = 1,216.78 : x
2. Step 2: Convert to fraction form
   2,860.22/4,290.82 = 1,216.78/x
3. Step 3: Cross multiply
   2,860.22x = 4,290.82 × 1,216.78
4. Step 4: Simplify right side
   2,860.22x = 5,220,983.96
5. Step 5: Solve for x
   x = 5,220,983.96/2,860.22
6. Step 6: Final answer
   x = 1,825.38