Finding the Fourth Proportional to 2,055.12, 3,083.40 and 1,284.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,055.12 : 3,083.40 = 1,284.72 : x
2. Step 2: Convert to fraction form
   2,055.12/3,083.40 = 1,284.72/x
3. Step 3: Cross multiply
   2,055.12x = 3,083.40 × 1,284.72
4. Step 4: Simplify right side
   2,055.12x = 3,961,305.65
5. Step 5: Solve for x
   x = 3,961,305.65/2,055.12
6. Step 6: Final answer
   x = 1,927.53