Finding the Fourth Proportional to 1,987.28, 2,742.50 and 1,148.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.28 : 2,742.50 = 1,148.03 : x
2. Step 2: Convert to fraction form
   1,987.28/2,742.50 = 1,148.03/x
3. Step 3: Cross multiply
   1,987.28x = 2,742.50 × 1,148.03
4. Step 4: Simplify right side
   1,987.28x = 3,148,452.82
5. Step 5: Solve for x
   x = 3,148,452.82/1,987.28
6. Step 6: Final answer
   x = 1,584.31