Finding the Fourth Proportional to 2,148.22, 3,221.28 and 1,108.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,148.22 : 3,221.28 = 1,108.72 : x
2. Step 2: Convert to fraction form
   2,148.22/3,221.28 = 1,108.72/x
3. Step 3: Cross multiply
   2,148.22x = 3,221.28 × 1,108.72
4. Step 4: Simplify right side
   2,148.22x = 3,571,497.56
5. Step 5: Solve for x
   x = 3,571,497.56/2,148.22
6. Step 6: Final answer
   x = 1,662.54