Finding the Fourth Proportional to 2,234.85, 3,084.09 and 1,290.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,234.85 : 3,084.09 = 1,290.72 : x
2. Step 2: Convert to fraction form
   2,234.85/3,084.09 = 1,290.72/x
3. Step 3: Cross multiply
   2,234.85x = 3,084.09 × 1,290.72
4. Step 4: Simplify right side
   2,234.85x = 3,980,696.64
5. Step 5: Solve for x
   x = 3,980,696.64/2,234.85
6. Step 6: Final answer
   x = 1,781.19