Finding the Fourth Proportional to 2,719.52, 4,079.76 and 870.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,719.52 : 4,079.76 = 870.96 : x
2. Step 2: Convert to fraction form
   2,719.52/4,079.76 = 870.96/x
3. Step 3: Cross multiply
   2,719.52x = 4,079.76 × 870.96
4. Step 4: Simplify right side
   2,719.52x = 3,553,307.77
5. Step 5: Solve for x
   x = 3,553,307.77/2,719.52
6. Step 6: Final answer
   x = 1,306.59