Finding the Fourth Proportional to 3,109.20, 4,662.72 and 917.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,109.20 : 4,662.72 = 917.34 : x
2. Step 2: Convert to fraction form
   3,109.20/4,662.72 = 917.34/x
3. Step 3: Cross multiply
   3,109.20x = 4,662.72 × 917.34
4. Step 4: Simplify right side
   3,109.20x = 4,277,299.56
5. Step 5: Solve for x
   x = 4,277,299.56/3,109.20
6. Step 6: Final answer
   x = 1,375.69