Finding the Fourth Proportional to 1,920.38, 2,647.67 and 1,422.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,920.38 : 2,647.67 = 1,422.18 : x
2. Step 2: Convert to fraction form
   1,920.38/2,647.67 = 1,422.18/x
3. Step 3: Cross multiply
   1,920.38x = 2,647.67 × 1,422.18
4. Step 4: Simplify right side
   1,920.38x = 3,765,456.21
5. Step 5: Solve for x
   x = 3,765,456.21/1,920.38
6. Step 6: Final answer
   x = 1,960.79