Finding the Fourth Proportional to 2,189.33, 3,021.60 and 1,393.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.33 : 3,021.60 = 1,393.30 : x
2. Step 2: Convert to fraction form
   2,189.33/3,021.60 = 1,393.30/x
3. Step 3: Cross multiply
   2,189.33x = 3,021.60 × 1,393.30
4. Step 4: Simplify right side
   2,189.33x = 4,209,995.28
5. Step 5: Solve for x
   x = 4,209,995.28/2,189.33
6. Step 6: Final answer
   x = 1,922.96