Finding the Fourth Proportional to 2,860.89, 4,291.18 and 912.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,860.89 : 4,291.18 = 912.94 : x
2. Step 2: Convert to fraction form
   2,860.89/4,291.18 = 912.94/x
3. Step 3: Cross multiply
   2,860.89x = 4,291.18 × 912.94
4. Step 4: Simplify right side
   2,860.89x = 3,917,576.86
5. Step 5: Solve for x
   x = 3,917,576.86/2,860.89
6. Step 6: Final answer
   x = 1,369.36