Finding the Third Proportional to 1,108.69 and 2,131.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.69 : 2,131.31 = 2,131.31 : x
2. Step 2: Convert to fraction form
   1,108.69/2,131.31 = 2,131.31/x
3. Step 3: Cross multiply
   1,108.69x = 2,131.31 × 2,131.31
4. Step 4: Simplify right side
   1,108.69x = 4,542,492.97
5. Step 5: Solve for x
   x = 4,542,492.97/1,108.69
6. Step 6: Final answer
   x = 4,097.18