Finding the Fourth Proportional to 2,719.29, 4,079.54 and 870.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,719.29 : 4,079.54 = 870.56 : x
2. Step 2: Convert to fraction form
   2,719.29/4,079.54 = 870.56/x
3. Step 3: Cross multiply
   2,719.29x = 4,079.54 × 870.56
4. Step 4: Simplify right side
   2,719.29x = 3,551,459.59
5. Step 5: Solve for x
   x = 3,551,459.59/2,719.29
6. Step 6: Final answer
   x = 1,306.02