Finding the Fourth Proportional to 2,179.72, 3,269.20 and 718.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,179.72 : 3,269.20 = 718.88 : x
2. Step 2: Convert to fraction form
   2,179.72/3,269.20 = 718.88/x
3. Step 3: Cross multiply
   2,179.72x = 3,269.20 × 718.88
4. Step 4: Simplify right side
   2,179.72x = 2,350,162.50
5. Step 5: Solve for x
   x = 2,350,162.50/2,179.72
6. Step 6: Final answer
   x = 1,078.19