Finding the Fourth Proportional to 2,218.32, 3,061.08 and 1,287

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.32 : 3,061.08 = 1,287 : x
2. Step 2: Convert to fraction form
   2,218.32/3,061.08 = 1,287/x
3. Step 3: Cross multiply
   2,218.32x = 3,061.08 × 1,287
4. Step 4: Simplify right side
   2,218.32x = 3,939,609.96
5. Step 5: Solve for x
   x = 3,939,609.96/2,218.32
6. Step 6: Final answer
   x = 1,775.94