Finding the Fourth Proportional to 1,440.04, 1,989.72 and 1,111.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.04 : 1,989.72 = 1,111.29 : x
2. Step 2: Convert to fraction form
   1,440.04/1,989.72 = 1,111.29/x
3. Step 3: Cross multiply
   1,440.04x = 1,989.72 × 1,111.29
4. Step 4: Simplify right side
   1,440.04x = 2,211,155.94
5. Step 5: Solve for x
   x = 2,211,155.94/1,440.04
6. Step 6: Final answer
   x = 1,535.48