Finding the Fourth Proportional to 2,185.76, 3,272.16 and 1,719.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.76 : 3,272.16 = 1,719.20 : x
2. Step 2: Convert to fraction form
   2,185.76/3,272.16 = 1,719.20/x
3. Step 3: Cross multiply
   2,185.76x = 3,272.16 × 1,719.20
4. Step 4: Simplify right side
   2,185.76x = 5,625,497.47
5. Step 5: Solve for x
   x = 5,625,497.47/2,185.76
6. Step 6: Final answer
   x = 2,573.70