Finding the Fourth Proportional to 1,915.72, 2,644.78 and 1,253.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,915.72 : 2,644.78 = 1,253.24 : x
2. Step 2: Convert to fraction form
   1,915.72/2,644.78 = 1,253.24/x
3. Step 3: Cross multiply
   1,915.72x = 2,644.78 × 1,253.24
4. Step 4: Simplify right side
   1,915.72x = 3,314,544.09
5. Step 5: Solve for x
   x = 3,314,544.09/1,915.72
6. Step 6: Final answer
   x = 1,730.18