Finding the Fourth Proportional to 1,987.40, 2,742.57 and 1,103.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.40 : 2,742.57 = 1,103.24 : x
2. Step 2: Convert to fraction form
   1,987.40/2,742.57 = 1,103.24/x
3. Step 3: Cross multiply
   1,987.40x = 2,742.57 × 1,103.24
4. Step 4: Simplify right side
   1,987.40x = 3,025,719.78
5. Step 5: Solve for x
   x = 3,025,719.78/1,987.40
6. Step 6: Final answer
   x = 1,522.45