Finding the Fourth Proportional to 1,987.76, 2,742.90 and 1,103.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.76 : 2,742.90 = 1,103.42 : x
2. Step 2: Convert to fraction form
   1,987.76/2,742.90 = 1,103.42/x
3. Step 3: Cross multiply
   1,987.76x = 2,742.90 × 1,103.42
4. Step 4: Simplify right side
   1,987.76x = 3,026,570.72
5. Step 5: Solve for x
   x = 3,026,570.72/1,987.76
6. Step 6: Final answer
   x = 1,522.60