Finding the Fourth Proportional to 4,128.06, 5,704.51 and 3,131.56

Step by Step Solution

1. Step 1: Write the proportion equation
   4,128.06 : 5,704.51 = 3,131.56 : x
2. Step 2: Convert to fraction form
   4,128.06/5,704.51 = 3,131.56/x
3. Step 3: Cross multiply
   4,128.06x = 5,704.51 × 3,131.56
4. Step 4: Simplify right side
   4,128.06x = 17,863,986.81
5. Step 5: Solve for x
   x = 17,863,986.81/4,128.06
6. Step 6: Final answer
   x = 4,327.45