Finding the Fourth Proportional to 2,285.03, 3,153.43 and 1,290.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,285.03 : 3,153.43 = 1,290.42 : x
2. Step 2: Convert to fraction form
   2,285.03/3,153.43 = 1,290.42/x
3. Step 3: Cross multiply
   2,285.03x = 3,153.43 × 1,290.42
4. Step 4: Simplify right side
   2,285.03x = 4,069,250.75
5. Step 5: Solve for x
   x = 4,069,250.75/2,285.03
6. Step 6: Final answer
   x = 1,780.83