Finding the Fourth Proportional to 1,105.38, 1,520.46 and 958.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.38 : 1,520.46 = 958.50 : x
2. Step 2: Convert to fraction form
   1,105.38/1,520.46 = 958.50/x
3. Step 3: Cross multiply
   1,105.38x = 1,520.46 × 958.50
4. Step 4: Simplify right side
   1,105.38x = 1,457,360.91
5. Step 5: Solve for x
   x = 1,457,360.91/1,105.38
6. Step 6: Final answer
   x = 1,318.43