Finding the Fourth Proportional to 3,109.23, 4,662.72 and 917.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,109.23 : 4,662.72 = 917.28 : x
2. Step 2: Convert to fraction form
   3,109.23/4,662.72 = 917.28/x
3. Step 3: Cross multiply
   3,109.23x = 4,662.72 × 917.28
4. Step 4: Simplify right side
   3,109.23x = 4,277,019.80
5. Step 5: Solve for x
   x = 4,277,019.80/3,109.23
6. Step 6: Final answer
   x = 1,375.59