Finding the Fourth Proportional to 1,987.51, 2,742.63 and 1,103.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.51 : 2,742.63 = 1,103.31 : x
2. Step 2: Convert to fraction form
   1,987.51/2,742.63 = 1,103.31/x
3. Step 3: Cross multiply
   1,987.51x = 2,742.63 × 1,103.31
4. Step 4: Simplify right side
   1,987.51x = 3,025,971.11
5. Step 5: Solve for x
   x = 3,025,971.11/1,987.51
6. Step 6: Final answer
   x = 1,522.49