Finding the Fourth Proportional to 2,189.68, 3,285.12 and 1,092.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.68 : 3,285.12 = 1,092.72 : x
2. Step 2: Convert to fraction form
   2,189.68/3,285.12 = 1,092.72/x
3. Step 3: Cross multiply
   2,189.68x = 3,285.12 × 1,092.72
4. Step 4: Simplify right side
   2,189.68x = 3,589,716.33
5. Step 5: Solve for x
   x = 3,589,716.33/2,189.68
6. Step 6: Final answer
   x = 1,639.38