Finding the Fourth Proportional to 2,285.45, 3,153.98 and 1,290.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,285.45 : 3,153.98 = 1,290.82 : x
2. Step 2: Convert to fraction form
   2,285.45/3,153.98 = 1,290.82/x
3. Step 3: Cross multiply
   2,285.45x = 3,153.98 × 1,290.82
4. Step 4: Simplify right side
   2,285.45x = 4,071,220.46
5. Step 5: Solve for x
   x = 4,071,220.46/2,285.45
6. Step 6: Final answer
   x = 1,781.36