Finding the Fourth Proportional to 1,987.81, 2,743.18 and 1,103.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.81 : 2,743.18 = 1,103.61 : x
2. Step 2: Convert to fraction form
   1,987.81/2,743.18 = 1,103.61/x
3. Step 3: Cross multiply
   1,987.81x = 2,743.18 × 1,103.61
4. Step 4: Simplify right side
   1,987.81x = 3,027,400.88
5. Step 5: Solve for x
   x = 3,027,400.88/1,987.81
6. Step 6: Final answer
   x = 1,522.98