Finding the Fourth Proportional to 1,290.88, 1,941 and 1,189.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.88 : 1,941 = 1,189.42 : x
2. Step 2: Convert to fraction form
   1,290.88/1,941 = 1,189.42/x
3. Step 3: Cross multiply
   1,290.88x = 1,941 × 1,189.42
4. Step 4: Simplify right side
   1,290.88x = 2,308,664.22
5. Step 5: Solve for x
   x = 2,308,664.22/1,290.88
6. Step 6: Final answer
   x = 1,788.44