Finding the Fourth Proportional to 1,544.41, 2,131.31 and 845.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,544.41 : 2,131.31 = 845.78 : x
2. Step 2: Convert to fraction form
   1,544.41/2,131.31 = 845.78/x
3. Step 3: Cross multiply
   1,544.41x = 2,131.31 × 845.78
4. Step 4: Simplify right side
   1,544.41x = 1,802,619.37
5. Step 5: Solve for x
   x = 1,802,619.37/1,544.41
6. Step 6: Final answer
   x = 1,167.19