Finding the Fourth Proportional to 2,234.78, 3,084.14 and 1,290.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,234.78 : 3,084.14 = 1,290.75 : x
2. Step 2: Convert to fraction form
   2,234.78/3,084.14 = 1,290.75/x
3. Step 3: Cross multiply
   2,234.78x = 3,084.14 × 1,290.75
4. Step 4: Simplify right side
   2,234.78x = 3,980,831.83
5. Step 5: Solve for x
   x = 3,980,831.83/2,234.78
6. Step 6: Final answer
   x = 1,781.31