Finding the Fourth Proportional to 2,218.76, 3,060.90 and 1,286.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.76 : 3,060.90 = 1,286.72 : x
2. Step 2: Convert to fraction form
   2,218.76/3,060.90 = 1,286.72/x
3. Step 3: Cross multiply
   2,218.76x = 3,060.90 × 1,286.72
4. Step 4: Simplify right side
   2,218.76x = 3,938,521.25
5. Step 5: Solve for x
   x = 3,938,521.25/2,218.76
6. Step 6: Final answer
   x = 1,775.10