Finding the Fourth Proportional to 1,144.06, 1,581.87 and 1,091.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.06 : 1,581.87 = 1,091.50 : x
2. Step 2: Convert to fraction form
   1,144.06/1,581.87 = 1,091.50/x
3. Step 3: Cross multiply
   1,144.06x = 1,581.87 × 1,091.50
4. Step 4: Simplify right side
   1,144.06x = 1,726,611.11
5. Step 5: Solve for x
   x = 1,726,611.11/1,144.06
6. Step 6: Final answer
   x = 1,509.20