Finding the Fourth Proportional to 2,189.86, 3,020.82 and 1,391.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.86 : 3,020.82 = 1,391.74 : x
2. Step 2: Convert to fraction form
   2,189.86/3,020.82 = 1,391.74/x
3. Step 3: Cross multiply
   2,189.86x = 3,020.82 × 1,391.74
4. Step 4: Simplify right side
   2,189.86x = 4,204,196.03
5. Step 5: Solve for x
   x = 4,204,196.03/2,189.86
6. Step 6: Final answer
   x = 1,919.85