Finding the Fourth Proportional to 2,284.80, 3,153.12 and 1,290.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,284.80 : 3,153.12 = 1,290.12 : x
2. Step 2: Convert to fraction form
   2,284.80/3,153.12 = 1,290.12/x
3. Step 3: Cross multiply
   2,284.80x = 3,153.12 × 1,290.12
4. Step 4: Simplify right side
   2,284.80x = 4,067,903.17
5. Step 5: Solve for x
   x = 4,067,903.17/2,284.80
6. Step 6: Final answer
   x = 1,780.42