Finding the Fourth Proportional to 2,285.32, 3,153.75 and 1,290.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,285.32 : 3,153.75 = 1,290.86 : x
2. Step 2: Convert to fraction form
   2,285.32/3,153.75 = 1,290.86/x
3. Step 3: Cross multiply
   2,285.32x = 3,153.75 × 1,290.86
4. Step 4: Simplify right side
   2,285.32x = 4,071,049.73
5. Step 5: Solve for x
   x = 4,071,049.73/2,285.32
6. Step 6: Final answer
   x = 1,781.39