Finding the Fourth Proportional to 2,860.56, 4,290.57 and 912.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,860.56 : 4,290.57 = 912.42 : x
2. Step 2: Convert to fraction form
   2,860.56/4,290.57 = 912.42/x
3. Step 3: Cross multiply
   2,860.56x = 4,290.57 × 912.42
4. Step 4: Simplify right side
   2,860.56x = 3,914,801.88
5. Step 5: Solve for x
   x = 3,914,801.88/2,860.56
6. Step 6: Final answer
   x = 1,368.54