Finding the Fourth Proportional to 2,147.22, 3,219.78 and 1,107.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.22 : 3,219.78 = 1,107.72 : x
2. Step 2: Convert to fraction form
   2,147.22/3,219.78 = 1,107.72/x
3. Step 3: Cross multiply
   2,147.22x = 3,219.78 × 1,107.72
4. Step 4: Simplify right side
   2,147.22x = 3,566,614.70
5. Step 5: Solve for x
   x = 3,566,614.70/2,147.22
6. Step 6: Final answer
   x = 1,661.04