Finding the Fourth Proportional to 2,189.86, 3,284.01 and 728.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.86 : 3,284.01 = 728.62 : x
2. Step 2: Convert to fraction form
   2,189.86/3,284.01 = 728.62/x
3. Step 3: Cross multiply
   2,189.86x = 3,284.01 × 728.62
4. Step 4: Simplify right side
   2,189.86x = 2,392,795.37
5. Step 5: Solve for x
   x = 2,392,795.37/2,189.86
6. Step 6: Final answer
   x = 1,092.67