Finding the Fourth Proportional to 2,867.78, 4,301.51 and 919.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,867.78 : 4,301.51 = 919.83 : x
2. Step 2: Convert to fraction form
   2,867.78/4,301.51 = 919.83/x
3. Step 3: Cross multiply
   2,867.78x = 4,301.51 × 919.83
4. Step 4: Simplify right side
   2,867.78x = 3,956,650.45
5. Step 5: Solve for x
   x = 3,956,650.45/2,867.78
6. Step 6: Final answer
   x = 1,379.69