Finding the Fourth Proportional to 1,891.55, 2,610.57 and 1,145.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,891.55 : 2,610.57 = 1,145.49 : x
2. Step 2: Convert to fraction form
   1,891.55/2,610.57 = 1,145.49/x
3. Step 3: Cross multiply
   1,891.55x = 2,610.57 × 1,145.49
4. Step 4: Simplify right side
   1,891.55x = 2,990,376.10
5. Step 5: Solve for x
   x = 2,990,376.10/1,891.55
6. Step 6: Final answer
   x = 1,580.91