Finding the Fourth Proportional to 2,576.68, 3,555.76 and 1,397.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,576.68 : 3,555.76 = 1,397.72 : x
2. Step 2: Convert to fraction form
   2,576.68/3,555.76 = 1,397.72/x
3. Step 3: Cross multiply
   2,576.68x = 3,555.76 × 1,397.72
4. Step 4: Simplify right side
   2,576.68x = 4,969,956.87
5. Step 5: Solve for x
   x = 4,969,956.87/2,576.68
6. Step 6: Final answer
   x = 1,928.82