Finding the Fourth Proportional to 2,188.10, 3,020.06 and 1,391.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.10 : 3,020.06 = 1,391.27 : x
2. Step 2: Convert to fraction form
   2,188.10/3,020.06 = 1,391.27/x
3. Step 3: Cross multiply
   2,188.10x = 3,020.06 × 1,391.27
4. Step 4: Simplify right side
   2,188.10x = 4,201,707.25
5. Step 5: Solve for x
   x = 4,201,707.25/2,188.10
6. Step 6: Final answer
   x = 1,920.26