Finding the Fourth Proportional to 2,109.12, 3,164.16 and 722.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.12 : 3,164.16 = 722.40 : x
2. Step 2: Convert to fraction form
   2,109.12/3,164.16 = 722.40/x
3. Step 3: Cross multiply
   2,109.12x = 3,164.16 × 722.40
4. Step 4: Simplify right side
   2,109.12x = 2,285,789.18
5. Step 5: Solve for x
   x = 2,285,789.18/2,109.12
6. Step 6: Final answer
   x = 1,083.76