Finding the Fourth Proportional to 2,189.61, 3,284.96 and 728.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.61 : 3,284.96 = 728.69 : x
2. Step 2: Convert to fraction form
   2,189.61/3,284.96 = 728.69/x
3. Step 3: Cross multiply
   2,189.61x = 3,284.96 × 728.69
4. Step 4: Simplify right side
   2,189.61x = 2,393,697.43
5. Step 5: Solve for x
   x = 2,393,697.43/2,189.61
6. Step 6: Final answer
   x = 1,093.21