Finding the Fourth Proportional to 1,729.47, 2,581.89 and 1,668.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,729.47 : 2,581.89 = 1,668.72 : x
2. Step 2: Convert to fraction form
   1,729.47/2,581.89 = 1,668.72/x
3. Step 3: Cross multiply
   1,729.47x = 2,581.89 × 1,668.72
4. Step 4: Simplify right side
   1,729.47x = 4,308,451.48
5. Step 5: Solve for x
   x = 4,308,451.48/1,729.47
6. Step 6: Final answer
   x = 2,491.20