Finding the Fourth Proportional to 1,105.67, 1,665.45 and 936.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.67 : 1,665.45 = 936.20 : x
2. Step 2: Convert to fraction form
   1,105.67/1,665.45 = 936.20/x
3. Step 3: Cross multiply
   1,105.67x = 1,665.45 × 936.20
4. Step 4: Simplify right side
   1,105.67x = 1,559,194.29
5. Step 5: Solve for x
   x = 1,559,194.29/1,105.67
6. Step 6: Final answer
   x = 1,410.18