Finding the Fourth Proportional to 1,290.04, 1,937.55 and 1,105.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.04 : 1,937.55 = 1,105.36 : x
2. Step 2: Convert to fraction form
   1,290.04/1,937.55 = 1,105.36/x
3. Step 3: Cross multiply
   1,290.04x = 1,937.55 × 1,105.36
4. Step 4: Simplify right side
   1,290.04x = 2,141,690.27
5. Step 5: Solve for x
   x = 2,141,690.27/1,290.04
6. Step 6: Final answer
   x = 1,660.17