Finding the Fourth Proportional to 2,218.26, 3,061.35 and 1,286.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.26 : 3,061.35 = 1,286.76 : x
2. Step 2: Convert to fraction form
   2,218.26/3,061.35 = 1,286.76/x
3. Step 3: Cross multiply
   2,218.26x = 3,061.35 × 1,286.76
4. Step 4: Simplify right side
   2,218.26x = 3,939,222.73
5. Step 5: Solve for x
   x = 3,939,222.73/2,218.26
6. Step 6: Final answer
   x = 1,775.82