Finding the Fourth Proportional to 2,860.47, 4,291.52 and 912.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,860.47 : 4,291.52 = 912.82 : x
2. Step 2: Convert to fraction form
   2,860.47/4,291.52 = 912.82/x
3. Step 3: Cross multiply
   2,860.47x = 4,291.52 × 912.82
4. Step 4: Simplify right side
   2,860.47x = 3,917,380.72
5. Step 5: Solve for x
   x = 3,917,380.72/2,860.47
6. Step 6: Final answer
   x = 1,369.49