Finding the Fourth Proportional to 2,576.78, 3,555.98 and 1,397.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,576.78 : 3,555.98 = 1,397.86 : x
2. Step 2: Convert to fraction form
   2,576.78/3,555.98 = 1,397.86/x
3. Step 3: Cross multiply
   2,576.78x = 3,555.98 × 1,397.86
4. Step 4: Simplify right side
   2,576.78x = 4,970,764.90
5. Step 5: Solve for x
   x = 4,970,764.90/2,576.78
6. Step 6: Final answer
   x = 1,929.06