Finding the Fourth Proportional to 2,285.82, 3,154.06 and 1,290.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,285.82 : 3,154.06 = 1,290.87 : x
2. Step 2: Convert to fraction form
   2,285.82/3,154.06 = 1,290.87/x
3. Step 3: Cross multiply
   2,285.82x = 3,154.06 × 1,290.87
4. Step 4: Simplify right side
   2,285.82x = 4,071,481.43
5. Step 5: Solve for x
   x = 4,071,481.43/2,285.82
6. Step 6: Final answer
   x = 1,781.19