Finding the Fourth Proportional to 2,719.42, 4,079.76 and 870.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,719.42 : 4,079.76 = 870.28 : x
2. Step 2: Convert to fraction form
   2,719.42/4,079.76 = 870.28/x
3. Step 3: Cross multiply
   2,719.42x = 4,079.76 × 870.28
4. Step 4: Simplify right side
   2,719.42x = 3,550,533.53
5. Step 5: Solve for x
   x = 3,550,533.53/2,719.42
6. Step 6: Final answer
   x = 1,305.62