Finding the Fourth Proportional to 2,576.85, 3,556.04 and 1,397.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,576.85 : 3,556.04 = 1,397.91 : x
2. Step 2: Convert to fraction form
   2,576.85/3,556.04 = 1,397.91/x
3. Step 3: Cross multiply
   2,576.85x = 3,556.04 × 1,397.91
4. Step 4: Simplify right side
   2,576.85x = 4,971,016.89
5. Step 5: Solve for x
   x = 4,971,016.89/2,576.85
6. Step 6: Final answer
   x = 1,929.11