Finding the Fourth Proportional to 2,005.56, 2,767.55 and 1,121.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,005.56 : 2,767.55 = 1,121.36 : x
2. Step 2: Convert to fraction form
   2,005.56/2,767.55 = 1,121.36/x
3. Step 3: Cross multiply
   2,005.56x = 2,767.55 × 1,121.36
4. Step 4: Simplify right side
   2,005.56x = 3,103,400.42
5. Step 5: Solve for x
   x = 3,103,400.42/2,005.56
6. Step 6: Final answer
   x = 1,547.40