Finding the Fourth Proportional to 1,105.92, 1,656 and 961.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.92 : 1,656 = 961.92 : x
2. Step 2: Convert to fraction form
   1,105.92/1,656 = 961.92/x
3. Step 3: Cross multiply
   1,105.92x = 1,656 × 961.92
4. Step 4: Simplify right side
   1,105.92x = 1,592,939.52
5. Step 5: Solve for x
   x = 1,592,939.52/1,105.92
6. Step 6: Final answer
   x = 1,440.38