Finding the Fourth Proportional to 1,891.77, 2,610.89 and 1,145.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,891.77 : 2,610.89 = 1,145.76 : x
2. Step 2: Convert to fraction form
   1,891.77/2,610.89 = 1,145.76/x
3. Step 3: Cross multiply
   1,891.77x = 2,610.89 × 1,145.76
4. Step 4: Simplify right side
   1,891.77x = 2,991,453.33
5. Step 5: Solve for x
   x = 2,991,453.33/1,891.77
6. Step 6: Final answer
   x = 1,581.30