Finding the Fourth Proportional to 1,290.24, 1,942.24 and 1,111.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.24 : 1,942.24 = 1,111.60 : x
2. Step 2: Convert to fraction form
   1,290.24/1,942.24 = 1,111.60/x
3. Step 3: Cross multiply
   1,290.24x = 1,942.24 × 1,111.60
4. Step 4: Simplify right side
   1,290.24x = 2,158,993.98
5. Step 5: Solve for x
   x = 2,158,993.98/1,290.24
6. Step 6: Final answer
   x = 1,673.33