Finding the Fourth Proportional to 1,091.56, 1,625.68 and 1,085.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.56 : 1,625.68 = 1,085.38 : x
2. Step 2: Convert to fraction form
   1,091.56/1,625.68 = 1,085.38/x
3. Step 3: Cross multiply
   1,091.56x = 1,625.68 × 1,085.38
4. Step 4: Simplify right side
   1,091.56x = 1,764,480.56
5. Step 5: Solve for x
   x = 1,764,480.56/1,091.56
6. Step 6: Final answer
   x = 1,616.48