Finding the Fourth Proportional to 2,867.58, 4,301.42 and 919.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,867.58 : 4,301.42 = 919.78 : x
2. Step 2: Convert to fraction form
   2,867.58/4,301.42 = 919.78/x
3. Step 3: Cross multiply
   2,867.58x = 4,301.42 × 919.78
4. Step 4: Simplify right side
   2,867.58x = 3,956,360.09
5. Step 5: Solve for x
   x = 3,956,360.09/2,867.58
6. Step 6: Final answer
   x = 1,379.69