Finding the Fourth Proportional to 2,178.72, 3,267.72 and 717.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,178.72 : 3,267.72 = 717.89 : x
2. Step 2: Convert to fraction form
   2,178.72/3,267.72 = 717.89/x
3. Step 3: Cross multiply
   2,178.72x = 3,267.72 × 717.89
4. Step 4: Simplify right side
   2,178.72x = 2,345,863.51
5. Step 5: Solve for x
   x = 2,345,863.51/2,178.72
6. Step 6: Final answer
   x = 1,076.72