Finding the Fourth Proportional to 2,576.72, 3,555.88 and 1,397.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,576.72 : 3,555.88 = 1,397.79 : x
2. Step 2: Convert to fraction form
   2,576.72/3,555.88 = 1,397.79/x
3. Step 3: Cross multiply
   2,576.72x = 3,555.88 × 1,397.79
4. Step 4: Simplify right side
   2,576.72x = 4,970,373.51
5. Step 5: Solve for x
   x = 4,970,373.51/2,576.72
6. Step 6: Final answer
   x = 1,928.95