Finding the Third Proportional to 1,987.31 and 2,791.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.31 : 2,791.69 = 2,791.69 : x
2. Step 2: Convert to fraction form
   1,987.31/2,791.69 = 2,791.69/x
3. Step 3: Cross multiply
   1,987.31x = 2,791.69 × 2,791.69
4. Step 4: Simplify right side
   1,987.31x = 7,793,519.10
5. Step 5: Solve for x
   x = 7,793,519.10/1,987.31
6. Step 6: Final answer
   x = 3,921.64