Finding the Fourth Proportional to 1,105.86, 1,662.44 and 923.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.86 : 1,662.44 = 923.61 : x
2. Step 2: Convert to fraction form
   1,105.86/1,662.44 = 923.61/x
3. Step 3: Cross multiply
   1,105.86x = 1,662.44 × 923.61
4. Step 4: Simplify right side
   1,105.86x = 1,535,441.59
5. Step 5: Solve for x
   x = 1,535,441.59/1,105.86
6. Step 6: Final answer
   x = 1,388.46