Finding the Fourth Proportional to 3,128.72, 4,317.68 and 1,731.52

Step by Step Solution

1. Step 1: Write the proportion equation
   3,128.72 : 4,317.68 = 1,731.52 : x
2. Step 2: Convert to fraction form
   3,128.72/4,317.68 = 1,731.52/x
3. Step 3: Cross multiply
   3,128.72x = 4,317.68 × 1,731.52
4. Step 4: Simplify right side
   3,128.72x = 7,476,149.27
5. Step 5: Solve for x
   x = 7,476,149.27/3,128.72
6. Step 6: Final answer
   x = 2,389.52