Finding the Fourth Proportional to 2,117.92, 3,178.24 and 1,144.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,117.92 : 3,178.24 = 1,144.72 : x
2. Step 2: Convert to fraction form
   2,117.92/3,178.24 = 1,144.72/x
3. Step 3: Cross multiply
   2,117.92x = 3,178.24 × 1,144.72
4. Step 4: Simplify right side
   2,117.92x = 3,638,194.89
5. Step 5: Solve for x
   x = 3,638,194.89/2,117.92
6. Step 6: Final answer
   x = 1,717.82