Finding the Fourth Proportional to 1,890.47, 2,608.91 and 1,144.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,890.47 : 2,608.91 = 1,144.57 : x
2. Step 2: Convert to fraction form
   1,890.47/2,608.91 = 1,144.57/x
3. Step 3: Cross multiply
   1,890.47x = 2,608.91 × 1,144.57
4. Step 4: Simplify right side
   1,890.47x = 2,986,080.12
5. Step 5: Solve for x
   x = 2,986,080.12/1,890.47
6. Step 6: Final answer
   x = 1,579.54