Finding the Fourth Proportional to 2,285.24, 3,153.60 and 1,290.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,285.24 : 3,153.60 = 1,290.50 : x
2. Step 2: Convert to fraction form
   2,285.24/3,153.60 = 1,290.50/x
3. Step 3: Cross multiply
   2,285.24x = 3,153.60 × 1,290.50
4. Step 4: Simplify right side
   2,285.24x = 4,069,705.03
5. Step 5: Solve for x
   x = 4,069,705.03/2,285.24
6. Step 6: Final answer
   x = 1,780.87