Finding the Fourth Proportional to 1,091.92, 1,635.18 and 846.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.92 : 1,635.18 = 846.40 : x
2. Step 2: Convert to fraction form
   1,091.92/1,635.18 = 846.40/x
3. Step 3: Cross multiply
   1,091.92x = 1,635.18 × 846.40
4. Step 4: Simplify right side
   1,091.92x = 1,384,016.35
5. Step 5: Solve for x
   x = 1,384,016.35/1,091.92
6. Step 6: Final answer
   x = 1,267.51