Finding the Fourth Proportional to 2,867.10, 4,300.56 and 919.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,867.10 : 4,300.56 = 919.28 : x
2. Step 2: Convert to fraction form
   2,867.10/4,300.56 = 919.28/x
3. Step 3: Cross multiply
   2,867.10x = 4,300.56 × 919.28
4. Step 4: Simplify right side
   2,867.10x = 3,953,397.29
5. Step 5: Solve for x
   x = 3,953,397.29/2,867.10
6. Step 6: Final answer
   x = 1,378.88