Finding the Fourth Proportional to 1,243.98, 1,716.78 and 889.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,243.98 : 1,716.78 = 889.94 : x
2. Step 2: Convert to fraction form
   1,243.98/1,716.78 = 889.94/x
3. Step 3: Cross multiply
   1,243.98x = 1,716.78 × 889.94
4. Step 4: Simplify right side
   1,243.98x = 1,527,822.61
5. Step 5: Solve for x
   x = 1,527,822.61/1,243.98
6. Step 6: Final answer
   x = 1,228.17