Finding the Fourth Proportional to 2,235.15, 3,084.78 and 1,290.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,235.15 : 3,084.78 = 1,290.94 : x
2. Step 2: Convert to fraction form
   2,235.15/3,084.78 = 1,290.94/x
3. Step 3: Cross multiply
   2,235.15x = 3,084.78 × 1,290.94
4. Step 4: Simplify right side
   2,235.15x = 3,982,265.89
5. Step 5: Solve for x
   x = 3,982,265.89/2,235.15
6. Step 6: Final answer
   x = 1,781.65