Finding the Fourth Proportional to 1,725.53, 2,578.17 and 1,278.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,725.53 : 2,578.17 = 1,278.87 : x
2. Step 2: Convert to fraction form
   1,725.53/2,578.17 = 1,278.87/x
3. Step 3: Cross multiply
   1,725.53x = 2,578.17 × 1,278.87
4. Step 4: Simplify right side
   1,725.53x = 3,297,144.27
5. Step 5: Solve for x
   x = 3,297,144.27/1,725.53
6. Step 6: Final answer
   x = 1,910.81