Finding the Fourth Proportional to 1,891.89, 2,610.59 and 1,145.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,891.89 : 2,610.59 = 1,145.57 : x
2. Step 2: Convert to fraction form
   1,891.89/2,610.59 = 1,145.57/x
3. Step 3: Cross multiply
   1,891.89x = 2,610.59 × 1,145.57
4. Step 4: Simplify right side
   1,891.89x = 2,990,594.81
5. Step 5: Solve for x
   x = 2,990,594.81/1,891.89
6. Step 6: Final answer
   x = 1,580.74