Finding the Fourth Proportional to 2,869.01, 4,300.78 and 919.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,869.01 : 4,300.78 = 919.88 : x
2. Step 2: Convert to fraction form
   2,869.01/4,300.78 = 919.88/x
3. Step 3: Cross multiply
   2,869.01x = 4,300.78 × 919.88
4. Step 4: Simplify right side
   2,869.01x = 3,956,201.51
5. Step 5: Solve for x
   x = 3,956,201.51/2,869.01
6. Step 6: Final answer
   x = 1,378.94