Finding the Fourth Proportional to 1,040.07, 1,436.31 and 889.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,040.07 : 1,436.31 = 889.83 : x
2. Step 2: Convert to fraction form
   1,040.07/1,436.31 = 889.83/x
3. Step 3: Cross multiply
   1,040.07x = 1,436.31 × 889.83
4. Step 4: Simplify right side
   1,040.07x = 1,278,071.73
5. Step 5: Solve for x
   x = 1,278,071.73/1,040.07
6. Step 6: Final answer
   x = 1,228.83