Finding the Fourth Proportional to 1,408.72, 1,942.93 and 911.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.72 : 1,942.93 = 911.41 : x
2. Step 2: Convert to fraction form
   1,408.72/1,942.93 = 911.41/x
3. Step 3: Cross multiply
   1,408.72x = 1,942.93 × 911.41
4. Step 4: Simplify right side
   1,408.72x = 1,770,805.83
5. Step 5: Solve for x
   x = 1,770,805.83/1,408.72
6. Step 6: Final answer
   x = 1,257.03