Finding the Fourth Proportional to 2,775.42, 4,146.89 and 2,678.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,775.42 : 4,146.89 = 2,678.55 : x
2. Step 2: Convert to fraction form
   2,775.42/4,146.89 = 2,678.55/x
3. Step 3: Cross multiply
   2,775.42x = 4,146.89 × 2,678.55
4. Step 4: Simplify right side
   2,775.42x = 11,107,638.82
5. Step 5: Solve for x
   x = 11,107,638.82/2,775.42
6. Step 6: Final answer
   x = 4,002.15