Finding the Fourth Proportional to 1,987.62, 2,742.68 and 1,103.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.62 : 2,742.68 = 1,103.20 : x
2. Step 2: Convert to fraction form
   1,987.62/2,742.68 = 1,103.20/x
3. Step 3: Cross multiply
   1,987.62x = 2,742.68 × 1,103.20
4. Step 4: Simplify right side
   1,987.62x = 3,025,710.86
5. Step 5: Solve for x
   x = 3,025,710.86/1,987.62
6. Step 6: Final answer
   x = 1,522.28