Finding the Fourth Proportional to 2,005.80, 2,768.00 and 1,121.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,005.80 : 2,768.00 = 1,121.61 : x
2. Step 2: Convert to fraction form
   2,005.80/2,768.00 = 1,121.61/x
3. Step 3: Cross multiply
   2,005.80x = 2,768.00 × 1,121.61
4. Step 4: Simplify right side
   2,005.80x = 3,104,610.87
5. Step 5: Solve for x
   x = 3,104,610.87/2,005.80
6. Step 6: Final answer
   x = 1,547.82