Finding the Fourth Proportional to 2,540.78, 3,506.31 and 1,421.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,540.78 : 3,506.31 = 1,421.76 : x
2. Step 2: Convert to fraction form
   2,540.78/3,506.31 = 1,421.76/x
3. Step 3: Cross multiply
   2,540.78x = 3,506.31 × 1,421.76
4. Step 4: Simplify right side
   2,540.78x = 4,985,124.20
5. Step 5: Solve for x
   x = 4,985,124.20/2,540.78
6. Step 6: Final answer
   x = 1,962.05