Finding the Fourth Proportional to 1,443.76, 1,993.28 and 1,111.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.76 : 1,993.28 = 1,111.55 : x
2. Step 2: Convert to fraction form
   1,443.76/1,993.28 = 1,111.55/x
3. Step 3: Cross multiply
   1,443.76x = 1,993.28 × 1,111.55
4. Step 4: Simplify right side
   1,443.76x = 2,215,614.86
5. Step 5: Solve for x
   x = 2,215,614.86/1,443.76
6. Step 6: Final answer
   x = 1,534.62