Finding the Fourth Proportional to 2,188.33, 3,020.22 and 1,392.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.33 : 3,020.22 = 1,392.30 : x
2. Step 2: Convert to fraction form
   2,188.33/3,020.22 = 1,392.30/x
3. Step 3: Cross multiply
   2,188.33x = 3,020.22 × 1,392.30
4. Step 4: Simplify right side
   2,188.33x = 4,205,052.31
5. Step 5: Solve for x
   x = 4,205,052.31/2,188.33
6. Step 6: Final answer
   x = 1,921.58