Finding the Fourth Proportional to 1,915.57, 2,644.31 and 1,118.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,915.57 : 2,644.31 = 1,118.59 : x
2. Step 2: Convert to fraction form
   1,915.57/2,644.31 = 1,118.59/x
3. Step 3: Cross multiply
   1,915.57x = 2,644.31 × 1,118.59
4. Step 4: Simplify right side
   1,915.57x = 2,957,909.78
5. Step 5: Solve for x
   x = 2,957,909.78/1,915.57
6. Step 6: Final answer
   x = 1,544.14